Alternator Exciter Wire Test

It supplies power to the exciter inside the alternator and that is why it is important that the warning light is working. The good news is that replacing a factory alternator with a high output alternator, in and of itself, isn’t going to damage the rest of the electronics in your car, even if the new alternator is much, much bigger than the old one. So ya, gonna have to check the wire that runs to the battery from the alternator & the small wire that plugs into the alternator. The brown wire is what would typically be tied to a charge warning lamp, and is responsible for exciting the charging system. If your ground, field wire and B+ wire all come up good you have an internal alternator problem. [Bruce Young] The Battery, parking brake, brake warning, and bulb failure lamps should all iluminate when the ignition switch applies battery +12 to one side of all 4 bulbs and the other side finds a path to ground via that small red exciter wire from the panel to: alternator D+ terminal, then. Returned the alternator to Auto Zone and went to Advanced. Trim the new stator plug down and strip the wire end. Discard the old regulator and stator plugs. Check the ground wire and the other end which connects to the chassis. 13 Car Buying Mistakes - How Auto Dealerships rip you off - How to buy a Vehicle from a Car Dealer - Duration: 8:00. Alternator Wiring Diagram. Mine read 14. Please read the entire procedure before starting. It may not pass the load test 2. The wiring diagrams I found on this site are great, but I'd really be helped to see a close up picture of how it's. Wiring a trail truck, rebuilding an alternator or making that perfect wire connection is all within reach with these tips from the Electrical Category. Voltage Regulator Wiring Diagram Throughout Cristinalattaro, size: 800 x 600 px, source: carlplant. Volt drop test from Neg battery term. The large red wire is the OUTPUT from the alternator. If the BLUE wire voltage is 3 to 8 volts, the alternator is working at low output. Alternator parts are all fairly inexpensive at your local auto parts store. Test at main alternator wire reveals output of approx. 2) When the alternator is not turning as when the engine is off but ignition on it functions to light the dash warning lights as a light test mode. Connect a Back-pinning Probe to the positive (colored) plug on test lead and place a black clip on the negative (black) plug. The ground lead or idiot light #2 hookup should always have a resistor in parallel to the light. Find the tiny terminal on your starter solenoid. Yanmar Alternator Wiring Diagram (Oct 08, 2019) - Thank you for visiting here. Next, if the alternator is considered to be the problem, then he or she will test the output. Once the alternator has been excited it will stay that way until the engine is shut down. If not, the structure will not function as…. I read that an alternative would be to run a standard wire with 2 resistors in series, a 15 ohm and then a 2 ohm. Step 2: Start engine Step 3: connect a wire from positive battery terminal to the F (field) terminal on the alternator. Red - Alternator light wire Blue - Alternator battery sense wire Yellow - auxiliary voltage wire Green - Field or ignition wire White - Stator / Aux. I believe the 12V from the battery back-fed thru the exciter wire and illuminated the light on the dash. JIMCO has been building test equipment for remanufacturers and auto-electric shops for more than 30 years. That's very strange. It will fail at some point and leave you stranded. My profile has an album with a picture of the circuit diagram. That's your starting point of reference. Engine Get your hands dirty with these engine tech tips for testing a junkyard motor, gapping and staggering your piston rings, or getting a lesson on Pro Stock Engine tech with the Engine Category. A 100 kVA direct-driven power station AC alternator with a separate belt-driven exciter generator, date c. the same voltage on the B+ wire as your battery has in it, hopefully 12. 00 or so for a new Diode Trio for a 27-si alternator, put it in and go find something else to work on. An ohmmeter sends a very low power electrical charge through a wire and measures how much resistance there is in the wire to the charge going through it. in the alternator harness there is a red wire, a black wire and a brown wire and im wondering if the red wire was a hot for the solenoid on the starter, as everything has power except the solenoid isnt engaging. Let me just point out that this test is not intended to diagnose a short-circuit in the vehicle's wiring harness. For testing purposes, I can quickly wire up this driver circuit and use a good signal generator for the 125KHz source. Malfunction If the exciter wire is disconnected or not working properly, it will not transmit voltage to the alternator, and as a result, the alternator will not generate enough power to operate accessories. My exciter or field wire isn't working going to the alternator but I can excite it by bring 12V to the alternator using a test wire. I've always preferred the 3 wire or a one wire. End Results: In this example the stator was wound with 81 ft of 22 gauge copper wire per phase. If he has the original Alternator then your pic Mick is no good, that Alt is from VN onwards (BXH or BXU series), principal of operation is the same, his Alt needs the wire from the charge Lamp in the dash pluged into the rear (not the side) of the Alt, I think there is only one place it can go. Discard the old regulator and stator plugs. High voltage drop between red alternator positive. If the lights don't come on, try holding the wire to a known ground (I use a jumper wire to the battery negative because the wire doesn't reach anything reliable by itself). As the rotor spins, a voltage is induced and its value depends on the speed of rotation and the DC exciting current in the stationary poles. Scroll to the bottom of the page to order _____ Delco SI to CS - Part W1201 Used to connect an early style Delco 10SI or 12SI internally regulated wiring harness to the later styl. DASH GROUP Includes wires to connect gauges, indicator lights, and switches to their proper sources. The following chart describes alternator output based on two temperature levels (ambient (26 o C) and hot (60 o C)). The other wire should go to a warning lamp, it provides the ground to the bulb when the alternator isn't charging. Start engine. An alternator that has a separate small alternator mounted on the shaft of its rotor is equipped with a(n) _____. The 3 wire alternator is a proven design and has been used for the past 30 years starting in the late 60s, early 70s. Click the button below to add the GM Alternator Internal Regulator 4 Wire Repair Pigtail to your wish list. Both should be under. Unknown: What is the "normal" volts for exciter wire when plugged into ALT, engine on? Is it normal for exciter wire volts to drop from over 12 to 7. Read on for more. This drawing isn't labeled as such but it is about 240 Volvos. Description of Alternator operation. If the BLUE wire voltage is 3 to 8 volts, the alternator is working at low output. Had the battery on the charger most of the day. Can I jump the exciter wire to something or test it with a voltmeter while turning over the engine? Will it register a signal from the exciter, or does the alternator supply the charge to the exciter?. Test voltage across the battery terminals with the engine running. If good, remove the plug from the exciter wire and plug it directly to the alternator "L" terminal. When I tested mine I showed 150+ volts. If the alternator fails any test category, your customer needs a new alternator. 6 volts, which means the battery isn’t causing the charging system problem. I bought a pack of dashboard lamps from ebay, not LEDs. Ford 8n Alternator found in: 63 Amp One Wire Alternator with Pulley -- Used for converting 6 Volt to 12 Volt, Alternator Bracket Kit (used in kit FDS1084), Alternator Conversion Kit, Restoration Quality Wiring Harness for Tractors. Cut both black/orange wires close to the alternator, allowing enough length to attach a splice (approximately 2 to 3 inches). I am putting a 3G Alternator in my Galaxie. How to Test Alternator with a Voltmeter Alternator test with a voltmeter. You have a lot of drop between the alternator and battery-. There are no existing wires run to the two voltage regulator terminals on the alternator. All that the previous owner had for connections were a ground to the block and the positive charge wire to the batteries via the starter. Single wire turn on alternators If your alternator comes with a pigtail that plugs into the alternator with a single loose wire coming out of it, this small exciter wire will need to be connected to an ignition switched source to turn the alternator on and off with the key switch. How To Test a Honda Accord Alternator – Testing Alternator wire. The I terminal of the switch also goes to the coil, so it has to go off when the key is turned off. On some designs, if the alternator (or charge or battery) lamp on the dash does not light when the ignition switch is turned on, no power will flow to the field. 2) Turn ignition on and check that alternator indicator light comes on. A bit of research tells me that the exciter wire (little browny yellow connection on alternator) runs through the dashboard via the battery light bulb and onto the battery, to register some kind of current consumption that tells the alternator it needs to start charging. That is the way the light works on older style alternators, newer ones will differ with ECU control of the light. This is the system voltage sensing used to control the regulator. Massey Ferguson alternator wiring connections The red wire should be 8 gauge and is Positive connects to battery positive. The purpose of this exercise was to divide the system between the alternator assembly and the cluster/wiring. Lot of times that plugin will go bad. TB1950 - Generator Hook-up Manual. Place the black clip on a suitable earth connection in the engine bay. Posted: Tue Dec 13, 2016 2:03 pm Post subject: alternator exciter wire I have an old ford that has been converted to a Delco alternator before I got it. The FAA refers to it as a lighting coil instead of an engine driven alternator. Also still confused if there are wires coming off of the starter and going back into the car. Talbot EXPRESS Owners Club & Forum. Part # D110Si12V105 - Delco type10Si Series 12 Volt 105 Amp Alternator, Negative Ground, Standard Hookup Regulator, 100% New, NO Core Charge. This complete automobile wiring system has been designed with three major groups incorporated into it: ENGINE/HEADLIGHT GROUP Includes high beam, low beam, park, right turn, left turn, electric fan, horn, starter solenoid and battery feed, alternator and alternator exciter wire, distributor, water temperature, oil pressure, and air conditioning. It has an external voltage sensing lead that is normally connected to the firewall at the +12V junction under the dash. Power from the ignition switch passes through the battery warning light and then to the alternator exciter circuit. Post by lummert » 19 Nov 2014, 17:51 I had a bad main head light relay that caused the overdrive light to come on, head lights not come on, and intermittent stalling that was cured by replacing the relay. in the run position without cranking check power out ot the switch also most marine applications are 2 wire check your grounds are hooks up. 6 volts, recharge or replace the battery as required ­before proceeding with the alternator test. 6 volts not 12 was obviously the issue. Did a quick test. Some days I'll go out and run the engine in idle for most of a 4-hour trip and find that my house battery has discharged during the entire trip. Connecting the sense wire to the batteries causes the alternator to output extra voltage to compensate for the voltage drop in the longer cables. Also available is an ammeter package (1965400). 3V to battery, it reads around 13V on exciter wire, so there's voltage drop. How To Test a vehicle alternator with a standard multimeter. The exciter field tap is the wire from the modular plug on the Delco alternator (marked #1). Reasons to choose DB Electrical for your next alternator: Built to Take the Heat – Most DB Electrical alternators offer high-temperature epoxy, heavy-duty rectifiers, high-quality regulators, top-quality bearings and high-temperature grease for better charging and longer life under high-heat environments. Crank engine for about 15 seconds to partially discharge battery. Momentarily (1 sec. DASH GROUP Includes wires to connect gauges, indicator lights, and switches to their proper sources. The voltage regulator is internal, and there are no other wires that need to be connected to your electrical system. All that the previous owner had for connections were a ground to the block and the positive charge wire to the batteries via the starter. so we can get that much current. 490066 DIODE STARTER TERMINAL * Terminal 1 Grounded Internally To Key Switch Case A M T R +--KEY SWITCH STOP SWITCH TERMINA. Re: Alternator Wiring & Exciter I'm not sure that it matters, or is a reason for the standard automotive use of a lamp (rather than a diode or resistor) but a lamp is a THERMISTOR. However, somewhere in the recesses of the dashboard there is somethng which looks for all the world like an inline fuse holder. Uses a 12 volt battery (not included) continuously, recharged during alternator testing. The load is usually a test light that connects the battery to the alternator exciter wire usually blue thin gauge on the alternator. One is usually the exciter wire, without it hooked up, you won't get any alternator output. If it is below 13V, check the exciter wire. Briefly touch the other end of the test jig to the wire you connected to the "+" terminal. Ford alternator wiring diagram internal regulator. Also measure the exciter wire voltage, not sure at this stage what it should be, should not be too hard to research or look in the wiring diagram it also have fault finding procedures. i think ive found the problemi have a question too is there supposed to be 2 fusible links on the alternator to junction box wire? it looks like there was one put there not from factoryit was inline with a really bad soldering job, only holding on by 2 strands of wirewhen i tested for continuity it gave me a complete circuit but i didnt remember that te ohm meter doesnt give. The exciter wire is merely a 12V load (the bulb in the dash cluster) which causes the regulator to start putting out 13. alternator and alternator exciter wire, distributor, water temperature, oil pressure, and air conditioning. Varying the amount of current through the stationary exciter field coils varies the 3-phase output from the exciter. If you full. All too often, the alternator is condemned as the source of the problem if only battery voltage is present with the engine running. Cut a 2-inch strip of thin wire using a knife. No resistor in the exciter wire, nothing except the basic plug and play type adapter harness. If amperage now meets specifications, there is a. Alternator positive post reads 13 when car is off. 01v drop (12. The way I understand it is that the diodes "convert" the A/C generated by the alternator (the Alt ( - ernating current) in Alternator) to DC so when you get above. 2 self-tapping sheet metal screws. Installed a Painless wiring harness and the alternator is not charging the battery. Terminal and terminal box. Part # D110Si12V105 - Delco type10Si Series 12 Volt 105 Amp Alternator, Negative Ground, Standard Hookup Regulator, 100% New, NO Core Charge. If you do, you’ve got a bad diode and you need a new alternator. Alternators and generators are two devices which generate electricity. Next, if the alternator is considered to be the problem, then he or she will test the output. The good news is that replacing a factory alternator with a high output alternator, in and of itself, isn’t going to damage the rest of the electronics in your car, even if the new alternator is much, much bigger than the old one. If you are not getting voltage out of an alternator, no light before start up or during running, the exciter wire is exciting and all the other wires are correct. LOAD TEST NOTE: If battery is fully charged, disable ignition system. ROTOR TESTING. The last couple years my alternator had no voltage at start-up, but if I revved the engine a few times the voltage came up to about 13. On many modern designs, the ECU controls the output of the alternator. On an alternator, a magnetic field is spun inside of windings of wire called a stator to generate the electricity. Varying the amount of current through the stationary exciter field coils varies the 3-phase output from the exciter. My alternator does work but only when you make a connection from the battery to the blue exciter wire on the alternator. Insert one end of second jumper wire in socket A in test tool. WIRE Key Switch Test AC OUTPUT WIRE HEADLIG T SWITCH A LTERNATOR HEADLIGHTS Typical Dual Circuit Alternator Wiring Diagram 5 Pole Switch -- Briggs & Stratton Part No. Engine-to-alternator drive ratios vary by engine, but a conversion factor of 2 is shown here for simplicity. One-wire alternators are internally MORE complex than 2/3 wire alternators and therefore less reliable. This alternator has an internal regulator and only has an "exciter" wire. If it is below 13V, check the exciter wire. Once the alternator has been excited it will stay that way until the engine is shut down. Connect a Back-pinning Probe to the positive (colored) plug on test lead and place a black clip on the negative (black) plug. How to Test an Alternator Need to test your alternator? We are a team of ASE certified mechanics that have created this guide for you so you can save money or at least see what you are paying for when taking your car in for repairs. Re: 1992 940GL Alternator Exciter wire no voltage. It should start up quickly, If the motor stalls or a bearing noise is noticed, do not proceed. I know that EuroVan is using LED in the dashboard for low battery indicator light. Remove jumper wire. Connect the red wire on that terminal to the negative lead of the multi-meter. Connect the multimeter as shown Poor charging system performance may be the result of a dirty, loose, and or corroded electrical connection between the B+ terminal of the alternator and the positive terminal of the battery. Check the wires at the plugin at the alternator, one may be broke under the insulation, and check the main positive wire running to the alternator, a lot of times there is a fuse-able link in that wire that may be burnt out. Autorestomod Manic Mechanic Gasoline Media 172,260 views. The #4 wire causes the regulator to "pull" in and then the exciter wire going to the alternator will be powered up. The one marked D+ should be connected into the wiring harness where the original alternator signal wire was connected. The resistor wired in parallel creates a backup in case the light bulb burns out. Tilt the front of the alternator down enough to gain access to the rear of the unit and then pry the boot away from the housing. On some german cars, the exciter wire circuit goes directly through the instrument cluster. I disconnected the battery, connected a wire to D+ on the back of the alternator, ran this wire up near the battery, zip-tied it in place so that it wouldn’t flop around, re-connected the battery, and started the car. 83 300D Alternator Exciter Wire Troubles Hi everybody, I recently bought another 123 for a song and drove it 4 hours home. How else can I excite the alternator and still have a warning light?. Trim back the harness tape and wire loom. If you have a 1 wire alternator in you street rod, custom or daily driver are you aware that parts for these are not stocked in most parts houses?. This is important as the alternator is designed for negative ground and the alternator regulator may be damaged if it is wired as positive ground. "exciter" wire?. That way the batteries get the correct voltage. ) Test your new alternator by using your voltmeter and touching the positive voltmeter wire to the positive terminal on the back of the alternator; touch the negative voltmeter wire to the negative battery terminal in the engine compartment. High voltage drop between red alternator positive. Our alternator kit also contains the pigtail exciter to ensure that the alternator will charge even if your harness doesn't have the plug, or if you're doing a carburetor. The test bench is the most important part of alternator testing, but test leads are what makes the tester fast and easy to use. Not sure if your alternator is in tip top shape? It's hard to tell whether or not an alternator works if you don't know what to look for. The problem was isolated using another bike to swap and test parts - it had to be either the CDI or the exciter winding. The other weird thing is the battery light never comes on whether the brown wire is hooked up or not. Re: Small home made engine driven alternator welder. Then I would suggest you spend the $4. If the wire is big enough, the voltage on both ends of the wire will be the same. Test #2-Turn on the motor switch for the desired rotation direction. Using a voltmeter, test between red wire and ground with battery terminal connected. First thing to do is with the key and eng off make sure the alt output wire is hot (has atlest 12 volts). If it is lower but the alternator output wire is in good condition, remove the alternator from the vehicle and test it. Convert Car Alternator To Wind Generator Wiring You will not regret if check price. Red - Alternator light wire Blue - Alternator battery sense wire Yellow - auxiliary voltage wire Green - Field or ignition wire White - Stator / Aux. Step 7- Test Connections. Delco 10SI alternator have a built-in voltage regulator. On this page you will find 6-volt, 8-volt and 12-volt complete alternators in both positive and negative ground configurations. Model 1900S Series Heavy Industrial Alternator Test Bench for Heavy Vehicles, Aviation,Mining and Defence Applications. There is a white wire with a black stripe attached to the post on the back of the alternator marked 'Sta'. The exciter wire is not what the regulator regulates toit regulates to the red wire on the two pin connector. First, the AL lead on the alternator must be jumpered to the F+ lead. One drawback of this arrangement is that if the warning light fails or the “exciter” wire is disconnected, no priming current reaches the alternator field windings and so the alternator will. I am currently in the process to put a switch inline with my field circuit wire. One Wire Alternator Wiring Diagram. Alternator troubleshooting for 86-95 5. Re: Alternator exciter wire #1 78 CJ I thought the resistance wire is there to help collapse the field in your alternator when you shut the ignition switch off. It supplies power to the exciter inside the alternator and that is why it is important that the warning light is working. GM always included this on all cars. Whoops forgot to add then that the Black w/Red is the POWER LEG of the EXCITER COIL? The same Manual says to Test the Alternator Lighting Coil to Test for Continuity Between The BLUE Wire and Ground. 3 wire alts are for cars with warning lights on the dash board. 1 wire vs 3 wire alternator plus other tips for classic cars muscle cars Episode 260 Autorestomod - Duration: 17:03. The wire from the back goes to the battery. Howto bench test an alternator? I have my alternator in a vice and I am ready with my volt meter, battery and drill but I am not sure how to wire it up. Here's why: most Delco Remy alternators have "Auto Start" capability that doesn't require a separate wire to excite the alternator to charge. Most often, the dash area with switches and fuse box is far from the alternator. This is the wire that attaches to the back of the alternator with a nut. Also measure the exciter wire voltage, not sure at this stage what it should be, should not be too hard to research or look in the wiring diagram it also have fault finding procedures. First thing to do is with the key and eng off make sure the alt output wire is hot (has atlest 12 volts). we got it finished and now have to figure out what the problem is. Connect this to the middle terminal on the side of the rectifier. Plug a BNC test lead into Channel C of the scope. 9, but not much at all at 13. Take the piece of 16 gauge wire and complete the circuit by connecting it to the connector wire. Without a resistance wire, the engine will keep running after the key is off due to feedback thru the (#1) exciter wire and thru a common splice with the coil. It may cause the starter to pull too many amps 3. Yours should be in the 14-volt range with the vehicle running. According to the Triumph manual you should use a 1 ohm resistor. The light illuminates if the voltage across the exciter circuit is different, lets you know something is wrong with the charging circuit. If there is low or no output, run a jumper wire from negative (-) battery terminal to the field terminalon the alternator. I was told I can hook a wire to my battery and another to the alternator with a switch and this will be a temporary fix. As the exciter armature windings rotate within the stator assembly 610 , one or more currents are generated in the exciter armature windings. TB1950 - Generator Hook-up Manual. Use one of the wires that you found in the wiring harness and cut it between the steering column and connector in the dash. Excitation in an alternator is the current applied to the rotor to make it a magnet with fixed polarity. ac electrical testing and troubleshooting guide bc gen tors westerbeke corporation • myles standish industrial park !50 john hancock road, taunton, ma 02780-7319 u. ADJUSTABLE LOAD TESTER. One-wire alternators are internally MORE complex than 2/3 wire alternators and therefore less reliable. If this is the case, it only means that the alternator is not charging, but does not reveal why. I did a swap into a VC and it had a 5L. If not, check wiring between alternator and battery. Usualy there are 4 wires, one wire is from the casing which goes to the negative terminal of the battery, then out of the other 3 wires, one is the field wire which you should connect to positive but make sure you put a basic on off switch, turn switch on when starting alternator, turn off once running and leve off when not in use. Find Alternators and Generators with GM CS130 Alternator Case Style and One-Wire Capable and get Free Shipping on Orders Over $99 at Summit Racing!. Easiest is to run a wire from the #2 terminal (marked on back of alt) of the built in regulator right to the output stud on the back of the alternator. For the easiest alternator test, simply turn on the headlights to your lawn mower or outdoor power equipment. I guess you could also hook up an ammeter between the fat red wire and the battery to measure the maximum output of the alternator, right? I also guess that you should not run it in this "test mode" for more than 60 seconds based on your first statement, or risk overheating the alternator. The car is shutting off because it had ben running off the battery until there is not enough juice left in the battery. One drawback of this arrangement is that if the warning light fails or the “exciter” wire is disconnected, no priming current reaches the alternator field windings and so the alternator will. 10Si Alternators, Positive Ground and Negative Ground, Alternators and Parts This is a special all in one page for the special uses of the Delco Remy type 10SI series alternator. 2) Turn ignition on and check that alternator indicator light comes on. The wiring harness has been hacked off where they should be hooked up so i need to know what needs to plug into what and where each wire needs to be ran. Key on, alt stopped, the bulb lights, once the alternator is turning it makes power and the amp light goes off. Torque Converter Issues and Alternator Noise Testing Before Testing - IMPORTANT PLEASE DO NOT SKIP! Before doing any testing of the alternator for AC noise, make sure to remove any and all wiring modifications. 5 or so VAC out of an alternator at the battery, the odds are at least one diode went bad. Howto bench test an alternator? I have my alternator in a vice and I am ready with my volt meter, battery and drill but I am not sure how to wire it up. I noticed that if I unplug the exciter wire, I get 14. On a generator windings of wire (the armature) spin inside a fixed magnetic field. Some days I'll go out and run the engine in idle for most of a 4-hour trip and find that my house battery has discharged during the entire trip. Follow NovaResource on Instagram and YouTube. Insert one end of the wire strip into the connector slot of the red wire on the plastic plug. Just dont want to fry my new starter. 24SI™ & 28SI™ ALTERNATOR INSTALLATION INSTRUCTIONS Note: Instructions for 24SI & 28SI to replace 21SI, 22SI & 24SI alternators are on the www. Dual alternator setup that is separated one alternator and battery runs the truck one alternator and battery runs the audio system Hey guys I'm JD and I've got a 2008 Chevy Silverado extra cab 4 by 4 flex fuel truck with a 5. The 33/34 SI alternator is designed for a “one-wire” charging system configuration. If the voltage is not high enough with the engine running, check the voltage at the thick red wire on the alternator. There should be 3 terminals on your solenoid. Check the wiring diagram for your model year and locate the sense line to the logic module. On machine after 1972 you will read 130ohms. ) Look for 12 volts at the alternator output. The ignition switch / exciter wire initially "turns the alternator on" when the system is first started. alternator gets really hot Sign In i have 2004 F350 6 liter powerstroke the alt gets hot and stops charging both batts and alternator are new i need some help please !!!!it shows its charging at 13. Remove both the armature and field wire from the generator. Alternators need DC excitation at the rotor to create rotating magnetic field. The idea is get an exciter circuit working, so I can see how much power I can pump into the exciter coil. Check the wires at the plugin at the alternator, one may be broke under the insulation, and check the main positive wire running to the alternator, a lot of times there is a fuse-able link in that wire that may be burnt out. How to just straight up test your alternator for output. The first four can be checked with an ohm meter for quality without disconnecting anything. 1 wire vs 3 wire alternator plus other tips for classic cars muscle cars Episode 260 Autorestomod - Duration: 17:03. Read on for more. Check the wiring diagram for your model year and locate the sense line to the logic module. To deliver the necessary volts, we run an exciter wire between the alternator and the idiot light; on Lucas systems, this is usually a brown wire with a yellow tracer. Custom wiring diagrams using Oregon motorcycle Parts regulator/rectifier units Honda SOHC fours up to 1978 KZ400 and KZ750 twins (late model with permanent magnet alternator) Pre 1978 Honda singles and twins Yamaha twins DS7, R5 RD250, RD350 & XS650 (original equipped with a separate regulator and rectifier) This is an updated version fixing. ARMY TM 9-6115-644-24 AIR FORCE TO 35C2-3-446-12 MARINE CORPS TM 09249A/09246A-24/2 GENERATOR STATOR EXCITER FIGURE 4-10. Once the engine is running and the alternator is generating, a diode feeds the field current from the alternator main output, thus equalizing the voltage across the warning light which goes out. Engine Get your hands dirty with these engine tech tips for testing a junkyard motor, gapping and staggering your piston rings, or getting a lesson on Pro Stock Engine tech with the Engine Category. LEROY SOMER SERVICE AND OPERATING MANUAL 2327 en - 11. One of those will be the exciter wire and should see +12V when the key is turned on. I am sorting out the wiring and my subaru alternator has the large white wire that goes on the alternator post plus the round connector that also has a large round wire plus three smaller colored wires, Green w/ black stripe, Black with white stripe, and solid yellow. If the alternator stops charging, the exciter wire become a ground for and the alternator light is illuminated. Fitting a new bulb. Engine off, ignition off, battery fully charged. Engine Get your hands dirty with these engine tech tips for testing a junkyard motor, gapping and staggering your piston rings, or getting a lesson on Pro Stock Engine tech with the Engine Category. If the alternator quits charging, then this wire loses its voltage and the light says I AIN'T WORKING, so you know something is wrong. A wire called an exciter generates the voltage needed for an alternator to start working once a vehicle is started. When I tested mine I showed 150+ volts. Alternator Exciter Wiring Diagram - alternator exciter circuit diagram, alternator exciter wiring diagram, Every electrical arrangement is made up of various different pieces. Repair vehicle wiring as necessary. If anyone has an idea, or at least knows if I'll blow something up if I just move the positive wire from the starter assist (pos wire goes from alternator to the starter assist, where it shares a common pole with a wire headed to the starter), to the isolator and leave all the other wires alone, I'd appreciate any advice. 490066 DIODE STARTER TERMINAL * Terminal 1 Grounded Internally To Key Switch Case A M T R +--KEY SWITCH STOP SWITCH TERMINA. 1 day ago · Find many great new & used options and get the best deals for JEEP CHEROKEE 1990 4. The exciter provides. Dual alternator setup that is separated one alternator and battery runs the truck one alternator and battery runs the audio system Hey guys I'm JD and I've got a 2008 Chevy Silverado extra cab 4 by 4 flex fuel truck with a 5. How to Test the Alternator on Yanmar Tractors Whether you have a large commercial Yanmar tractor or a smaller one that you use just for mowing the lawn, the machine won't do much good if its. ROTOR TESTING. This alternator is from a 1980 Chevy Malibu and is a three-wire style. Alternator field wire - is the current draw continuous? I am trying to summarize my continuous vs. Something just ain't right if you can only get a battery to read 10. Connect this to the middle terminal on the side of the rectifier. June 9, 2014 : Followup from the Pelican Staff: You could be missing 12 volts at the alternator field wire. It will self-excite, meaning that it can start charging and stop charging all on its own. Generators are not covered here because I'm not sure they were standardized very well. Insulation: 5/15KV Jumper-Exciter Transformer Lead Wire has a heat and moisture resistant 175mil thick ethylene propylene EPR insulation. net, comments to [email protected] I am sorting out the wiring and my subaru alternator has the large white wire that goes on the alternator post plus the round connector that also has a large round wire plus three smaller colored wires, Green w/ black stripe, Black with white stripe, and solid yellow. Internal wiring of Motorola Alternator w/ external regulator. ) Look for 12 volts at the alternator output. Connecting the sense wire to the batteries causes the alternator to output extra voltage to compensate for the voltage drop in the longer cables. If the charging system failed the test, your mechanic will need to do further diagnostic to see if it's the alternator or something else causing the problem. Welders Schematics: In the lower right hand corner of every schematics is a diagram number. 2) Turn ignition on and check that alternator indicator light comes on. It replaced an identical 22SI model. The drawback of this arrangement is that if the warning lamp burns out or the "exciter" wire is disconnected, no current reaches the field windings and the alternator will not generate power. Any problems within the wires, cables or connections at either end can reduce or stop electricity from getting through. I did a swap into a VC and it had a 5L. Below we will explain how to identify these wires and connect the alternator to your vehicle. The prior and very suspect alternator/wiring had no exciter wire, so I left the new Sierra-supplied Exciter wire in the box. One wire: Alternators that have one positive wire connected to the alternator has the ground connected to it's case. The other terminal is the exciter. Is the exciter wire supposed to have power all the time or oy on start? I have a Rob MC starter. How to just straight up test your alternator for output. The alternator has tested fine and the bulb has been swapped out with a know good bulb ,so, that leaves the wiring at the blue wire. If I read your post correctly you have no voltage on the #4 wire. - To test the rotor for grounds, shorts, and opens, perform the following: To check for grounds, connect a test lamp or ohmmeter from one of the slip rings to the rotor shaft (fig. If you don't you'd still have to build the test bench in the cold. Alternator turning, electricity comes out of the terminal that the exciter wire connects to (that is one reason the battery light works the way it does) and runs to the coil terminal (15), turn off the ignition and because the alternator is still sending power to that terminal, the engine keeps running. Tested alternator by applying 12vdc to exciter leg momentarily, charging circuit started and 13. Replacing the stock alternator with a high output alternator can provide the extra amps that many vehicles need, especially those with aftermarket high output radios and other electronics. when I kick it over the dash lights up and so does the head lights but no spark even when hooked up to a battery. If i unplug the battery and test the wire its not live when car is running (should be), But when its on the battery it lights up (should be, this shows there are no breaks in the wires).