He takes it apart and finds the wire that connects the 12V post on the back is broken. Since the alternator is turning, you also have battery voltage on the exciter wire from the alternator. The vibratory plate has been designed for the compaction of almost every type of soil, both in trenches as well as surface compaction. Zener diode is a simple component to understand in a electronic components and it work Normal in your circuit diagram, the time you used it. I’m at the point of wiring up my alternator and need some assistance. This is an important area that might have been troublesome for a lot of people, if not for the ONE-WIRE. 9TD ABL, the Rev counter recently stopped working with a damaged Exciter wire from the alternator. The alt starts its work like this: it does not independently charge at ignition, as it needs +12V supply to initiate the electromagnetic "field" current that starts the charging process; that initial voltage is provided via the exciter terminal. Not sure how the exciter wiring works but my 89 blazer has a. So connect the wire off the oil pressure switch and good to go! Thanks again for help!!. Paying attention to the 10 trouble signs on this list can make it a little easier to diagnose car trouble caused by the alternator. Panic not though, here’s a few helpful hints to try and fix your woes!. Typically you get BATTERY/ALTERNATOR VISIT WORKSHOP warning when the electrical system voltage in the car is below 12. NOTE: Avoid using the vehicle’s original alternator exciter wire as the charge indicator light will remain “lit” even though the alternator is functioning properly. From what you say about the No. The battery voltage should not fall below 9. If the battery light in the cluster doesn't come on with ignition switched on, and go out when engine is started, the blue alternator exciter wire is broken somewhere. Current from the battery to the alternator is routed through the charging system warning light in the instrument cluster via a blue exciter wire. A brushless alternator is composed of two alternators built end-to-end on one shaft. How do I get current the blue exciter wire? if the wire from the Isuzu will not work, what is a work around? Thanks. D+ is for the exciter, alternator dash signal light and voltage regulator circuit. As near as we can tell, here's how it works:. The battery is what keeps the voltage near ~14V. I suspect this has something to do with the alternator fault and that the glow plugs are not working either. quite common for the alternator load management wire to break which stops the. The red wire (with the ring terminal) attaches to the same (10/32) stud on the back of the alternator that you attached the (BATT) wire too. Can someone please advise what the smaller wire connected to the alternator on my daughters 2002 Clio II 1. Covers 89-99 Golf and Jetta, 90-97 Passat, all Cabrios, Corrados, and EuroVans. Once the voltage regulator turns on, the alternator will remain on and charging until the engine comes to a complete stop. Under normal operation (like, when your car was new) the blue exciter wire off the alternator normally goes through the alternator bulb in the instrument cluster. Voltage regulators are commonly found in vehicles and other electronic equipment. The big wire (b+) should be hot battery voltage when not running if not there's your issue (switches?). It looks to me like you are on top of the problem. Water possibly down there? I am not getting power from the alternator. If there is battery voltage on D+, temporarily attach the terminal on the end of the D+ wire to chassis ground using a wire with alligator clips at both ends. Though you probably will not know the armature’s intended resistance value, each measurement should read about the same. I have x2 connectors to my alternator: 1. It controls output by sensing the voltage V out at a power-generating coil and comparing it to a stable reference. ‘Why won’t my VW start’ … a phrase muttered by many an enthusiast over the years. There are other ways to do it. 4 and started the car. Without the 510ohm resistor it screws up the regulator on the alternator by sending too much voltage to the exciter wire. If a wiring modification of this level is not something you wish to tackle, reproduction engine wire harnesses for pre-1970 Mopars can be purchased that incorporate the newer voltage regulator and electronic ignition wiring and connectors. Question is, is the issue with my wiring or with the alternator? With key on, engine not running, the idiot light is on but there is no voltage at the exciter wire where it plugs into the alternator. Two wire means that you use the main battery wire to the back of the alternator and also ignition wire to the #1 terminal to activate the alternator. Ergo, it's absolutely essential that you keep a check on the working of the alternator or you may be left high and dry with no power to drive your car!. My name is Israel and am in San Antonio, TX I drive a '99 Ford Ranger 6 cyl and my speedometer is not working and the ABS light and check Engine light are on. They run things until they quit, which is not aircraft maintenance. I re-wired my exciter wire setup. I am looking for a wiring diagram for a 1978 ford thunderbird 351 windsor. Putting the bulb in series with the exciter wire eliminates the need for a diode. Problem: No warning light Possible causes: 1. But it happens. My name is Israel and am in San Antonio, TX I drive a '99 Ford Ranger 6 cyl and my speedometer is not working and the ABS light and check Engine light are on. D Sustained short-circuit current of up to 300% of the rated current for up to 10 seconds. 5 volts at the battery while idling. If you do not - the alternator will back-feed to the ignition and you may not be able to shut the engine off. Alternator did work. When it starts rotating a voltage is generated in Exciter armature which gives current to the main field to produce magnetic field in Main alternator. Main Alternator. So this is telling me that no wires were crossed, etc. How to Excite the One Wire - Self Exciting Alternator. The one wire alternator has no voltage sensing lead which means that it can only regulate the +12V (actually +14V) at the alternator. 1 wire it seems that it is working like it should be. If the charging system is working is working correctly, the voltage output should be initially significantly higher and then reduce as the engine bay temperature increases. If you don't have an exciter wire you will not show a charge on your volt meter until your battery needs to charge, that usually doesn't happen until you rev it the first time. I think what's happened is the exciter wire has snapped somewhere further back and they have used the fudge to give it a 12v signal. 4 with engine running. so i figure alternator or battery. I would suspect that you probably have a failed diode but you also could have an open "exciter" wire if your system requires one. On machine prior to 1972 the OHMS across the stranded windings should read 167ohms. i just rewired the alternator to the regulator, and bought a new pigtail for it. Question on exciter which wire on alternator is it and can you manually start it? Tach not working along with hour meter is this possible related to the charging problem?. The MOPAR, two-wire voltage regulator system, both the early mechanical and later electronic, did not have the remote voltage-sensing feature. Sounds as if the wire that is intended to excite the alternator has an open & isn't providing electricity to regulator when ign switch is turned on. Two wire means that you use the main battery wire to the back of the alternator and also ignition wire to the #1 terminal to activate the alternator. If the contacts are short in length, they are worn and need to be replaced. I was looking at the wire diagrams and it appears that the 'exciter' wire should have battery voltage when in run and start. Has distributor upgrade. Also available is an ammeter package (1965400). If you hook the exciter wire to your ignition, it will work, but when you go to turn the engine off, the alt will "backfeed" power to the coil and the engine will keep running. 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. I re-installed the first (non working) one, figuring I had missed something in the install. That means. If the alternator is not getting any power, it cannot turn the pulley and belt mechanism that charges the battery, and the battery will not charge. 5 amps that I was getting, has dropped back down to 0-10ma. This may seem strange, but the current needed to recharge the battery would not flow at all if the charging system's output voltage was the same as the battery voltage. The other is the wire I pulled off and do not remember where it goesI hooked it to the alt. [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. Main Alternator. DC power→ electromagnets→ Rotation → Rotating Magnetic field. In getting the replacement, the Malibu dealer here in Dallas said that the 70 amp model should work, with a few wiring changes. voltage signal to the alternator telling the alt to start charging. The battery voltage should not fall below 9. 5 v) when connected. That means. With that in mind, it can be tremendously useful to start off by looking at whether both, or just one, of your headlights have failed, and whether or not the high or low beam mode still works. Remove the spark plug In general, this process should be performed after the engine has cooled. The reading should show between 0. For example, a 90 V dc motor will have smaller conductors and more turns per coil to raise resistance, whereas, a 12 V dc motor will have larger conductors and less turns per coil to lower resistance. The new alternator has "BATT", ground, a plug labelled "S" and "I", and a "P" terminal. It should measure 12v when switched by the ignition. there is a blue (or green depending on model and year) wire that goes from the alternator to the fuse box, then to the dash cluster to light up the battery light 3. The lead supplies power to the exciter field of the alternator which gets the alternator action started. I'm having a seriously frustrating alternator issue, which I'll explain after a few pics of my car. Prior to deadlining the alternator, I would question your voltage measuring and the idiot light. I understand that the ignition key is to send this 12v signal but it aint workin so that's why I do it with a test wire at the alternator plug (3 wire). my battery is not charging, i replaced both the battery and alternator with brand new replacements, still my battery is drained while engine is on, i checked my ground, it is good, i've replaced my terminals, checked my fuses and tested the engine on without the. They may not be and that would cause the alternator to not charge the battery. Run the exciter wire from the "RUN" position of the ignition switch through an idiot light and to the alternator. Remove wires (Typically 2 or 3) from voltage regulator. Wire size is based on 4' battery cables. I tried to make the correct method a little more concise and clear. 4V for adequate battery charging. The excite wire is feed through the key switch to the number 1 terminal on the regulator. (If the cover has been fitted you will just see a black plastic clip on cover). On my 82, the alternator resistance wire you are referring to, is called the "exciter" wire. how do you excite a alternator - Chevrolet 3500 question The older gm alts there is a d shape hole in th read ground wire into that hole it should start to winde. Ignition does seem to operate odd. 4 with engine running. Use of such equipment could damage the AVR. Installing a "dummy" light or diode in series does not allow the alt to do this by breaking the circuit, the engine shuts down. I am running a one wire alternator. is this a common problem? i thought that the problem was fixed but the alt is still not putting out, i rode elsie to work today and when i got. is best Brushless AC Generator, Diesel AC Generator and Single Phase AC Generator supplier, we has good quality products & service from China. Would be nice to prove that the alternator is working correctly though, and get it charging so you can at least drive the car while figuring out the other problem. The contacts inside that red box are all clean and the original jump wire from the alternator has continuity so i have no idea why it wont work hooked up that way. Many translated example sentences containing "exciter excitation" – Dutch-English dictionary and search engine for Dutch translations. Terminal 2 (inside wire) should have 12 volts at all times. In larger sized generator, energy for excitation is often taken from a separate auxiliary source or from a separately driven DC generator. This code enables linking of the wire number to the type of supply or the electrical function. So I am thinking bad alternator diode or some other source of parasitic drain. When I remove the fudged wire the alternator no longer kicks in, however on removal of this wire I no longer have the parasitic drain of 0. Get yours today!. The blue field wire runs between the other alternator field terminal, to the VR, then on to a master splice in the engine compartment wiring that provides ignition switched power to everything under the hood. Between the both of us we have about 5 used voltage regulators and even with the rebuilt alternator and swapping out the voltage regulators it is still charging with 12. From what you say about the No. on my Volvo 850, when the alternator failed and the earth path for the alternator exciter was broken, all of the instrument bulbs on the dashboard lit up, due to the failure. This database includes information received by NHTSA from consumers either directly or as recorded by the Vehicle Safety Hotline. Stine, how to wire an alternator on a. Since the alternator is turning, you also have battery voltage on the exciter wire from the alternator. The third position is the ‘start’ mode where you exert key pressure to actually fire the engine up. Power losses and damage to the prime mover are avoided. If the battery is dead enough the alternator will not work so it cant charge the battery. They are ready to go when you are!. Suspect exciter wire is not working, but not sure if I should bypass this with a direct wire from battery to test my assumption. The 4 x 4 module and the wiring need to be replaced, costing $1000. 8 When the exciter wire is not functioning the volts drop to 1. The warning light wire is usually the smallest of the wires in the multi-plug. The smaller one is the exciter. alternator isn't charging the battery. If it’s in the range, it’s good. When the motor is running the alternator output is only 11. I don't have these either so I put shrink wrap on the ends of those also. Note: the alternator charge wire routes direct to the battery and not through any switch connection, the alternator will not operate correctly if not connected direct to battery or directly through the ammeter. Like a DC generator, an alternator also has an armature winding and a field winding. Flashing a generator Authored by: ? Brought to you by www. If you hook the exciter wire to your ignition, it will work, but when you go to turn the engine off, the alt will "backfeed" power to the coil and the engine will keep running. I've checked voltage at the alternator lug with the car off and I see a 0. if you take a jumper from the battery to the d+ or exciter wire when your alternator is spinning, then you should see the Alternator start to charge, that is a DVOM will go from 11. Please don't use friction tape. Welcome to Jetboaters. Might work, but will probably overcharge due to 12v going to the white exciter wire. Not just that, the online version of books are typically much cheaper, because publication homes save on their print in addition to paper machinery, the rewards of which are transferred to customers. They may not be and that would cause the alternator to not charge the battery. Relating to alternator indicator lights in vehicles if it lights up to tell me the alternator is not working that's an alternator light to me. 302 Welder Welder 230 460 Dc Inverter Arc Lincoln Ln-7 Nelson Stud 250 Mig Welder Dc Arc Welding Power Source Welder Ln-25 Welding Power Source Welder 250 Welder Generator Welder Local Nelson Stud Welder 450 Welder Lincoln Pipeliner Welder 220V Ac-225 Arc Lincoln Electric Weld-Pak Arc Welder Power Source Lincoln Idealarc 250 Arc Welder Generator Dc Inverter Arc Welder Welder Unit Ln-25 Wire. The DC generator generates a small amount of electricity just enough to excite the field coils of the connected alternator to generate electricity. I agree something is wrong in the exciter (blue wire) circuit. If voltage is a constant. Alternator positive post reads 13 when car is off. Would be nice to prove that the alternator is working correctly though, and get it charging so you can at least drive the car while figuring out the other problem. The small spade terminal on the alternator is the exciter wire. And the alternator is charging just fine, but the Perfect Pass is not working, so I will trouble shoot that tomorrow. This wire provides the initial power to the field winding in the rotor when the alternator is first started up. Alternator not charging. Have a look at his website, has wiring diagrams for Cubs to 450's. Take it back to my alternator guy and tell him what happened. Check the positive and negative supply to the alternator 3. Exciter wire to positive side of coil. In re-reading your first post, it sounds like the "S" and "EXC" connections are wires and not terminals on the alternator. Cycle Electric sells wholesale only, so those of you who would be interested in ordering should catch me at my booth (W-02) or bug your local dealer to contact them directly. They run things until they quit, which is not aircraft maintenance. Once the voltage regulator turns on, the alternator will remain on and charging until the engine comes to a complete stop. Pulling maybe 200A in bursts, have it turned down a lot. 12V+ is provided from the ignition switch, through the charge warning lamp and - via a diode - to. A variation of this system is a type of alternator which uses direct current from the battery for initial excitation upon start-up, after which the alternator becomes self-excited. Even if you conclude the alternator is not working, the problem may originate elsewhere. Re: 1992 940GL Alternator Exciter wire no voltage. is best Brushless AC Generator, Diesel AC Generator and Single Phase AC Generator supplier, we has good quality products & service from China. An alternator can have blown main diodes, faulty exciter diodes, a faulty regulator, which can cause low output without bringing up the warning lamp. It's not giving 12 volts. To see how frequently 2005 Volkswagen Passat problems occur, check out our car reliability stats. block then into the car and connects to the "battery" idiot light. The one wire alternator has no voltage sensing lead which means that it can only regulate the +12V (actually +14V) at the alternator. It has stationary field coils and a rotating armature with a rectifier. This wire sometimes only shows. Send a pic of the back of the alternator. Two-wire Alternator: Most standard and all self-exciting regulator alternators will work using the two wire setup. B5 AFN, Battery light on - brand new alternator! From engines to interiors , have you a question or can you help, ask and answer here ! Moderators: desertstorm , water01 , vwnutant. If there is battery voltage on D+, temporarily attach the terminal on the end of the D+ wire to chassis ground using a wire with alligator clips at both ends. That makes no sense to me since they are on the same circuit. It has stationary field coils and a rotating armature with a rectifier. They control the primarily the lights, horn, and ignition since mopeds tend to not have other electrical subsystems. alternator isn't charging the battery. 02B CUa41a FP544a. Main Alternator. The smaller of the two wires is the exciter voltage that should be 12 volts with the ignition switch on. i have read all kinds of posts and seen many diagrams on the internet, my question is do i really not need the factory plug? from what i have read they say to hook up the alternator and just tuck the plug away, but dont those wires need to be hooked up? and if so can the plug be cut off and the wires put where they. Either the regulator simply shorted out internally (or from a serious external short), or adequate water supply was not present to keep the regulator cool. In an electromagnet there is a coil of wire around an iron bar (the armature). Presenting Alternator 44phn in stock and ready for shipping today!. Posted in MEP016D Generators and Parts, Support and Troubleshooting, Yanmar | Tagged Wiring 3 Comments FAQ , MEP002A , MEP003A , Support and Troubleshooting How To Break-In a New Re-manufactured Engine or a New Refurbished Generator from GMG. Problem could be a break in the wire or bad connection at wiring bulkhead at firewall behind engine. In the wiring diagram i have it says the wire is for Alternator Exciter Wire (all cars 1991+ except MK2) and ive no idea what means!! Next issue i have is that the rev gauge is not working. If vehicle has an ignition wire, it does not need to be connected to the alternator. The 'L' lead is the lamp lead that normally ties to the w/r wire which is connected in series with the battery warning light and then to switched ignition power (the ignition switch). Change Wire Size Gauge 6 GA. Even if you conclude the alternator is not working, the problem may originate elsewhere. Alternators need DC excitation at the rotor to create rotating magnetic field. Really ? And in this case, an unlit battery bulb is a troubleshooting clue that rules out a multimeter readings which show an alternator that does not charge while running ? Uh, yeah. D connection is such that the hold on coil circuit will function at star but not in delta. For generators operating with another generator, it is imperative that the power direction be supervised. That wire will have no voltage on it while the engine isn't running. Fixing them might restore functionality to normalcy. But I installed a new voltmeter and I cant make it show over 13 volts unless I take a jumper wire and energize it, then it shows over 14 V. I do not have power to the small yellow wire at the top of the key cylinder housing circuit while the key is in start or run, whereas I did before. Thanks for the replies so far guys. You should have battery voltage thereabouts down the thin blue wire to alternator, This is ignition live up to cluster,through the warning light bulb then down to alternator, Earthing it should bring alternator lamp on nice and bright. i just rewired the alternator to the regulator, and bought a new pigtail for it. Also at the panel, the phase indication light for red is not working. The voltage regulator has four wires (black, green, yellow, orange) but no markings to what they go to on the alternator (Kind of know by the jeep tech service manual but not completely sure). It looks to me like you are on top of the problem. So naturally with the ignition on, I checked the female number 6 for ground and it was open, so somewhere along that wire or possibly in or at the alternator itself it is not working correctly to provide that ground on Startup. 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. Installing a "dummy" light or diode in series does not allow the alt to do this by breaking the circuit, the engine shuts down. What is that potted thing next to the solenoid. The exciter has stationary field coils. Anyway back on the diag work. Now snap the DA Plug, into the top of the alternator. Thanks for the replies so far guys. Unfortunately, the convenience that comes with this type of charging system presents a challenge for many users. When the alternator is working, it generates voltage on that lead, the current through the lamp stops and the light goes out until there is a problem with the charging circuit which will turn on the warning lamp. Battery registers 13 volts. From what you say about the No. There is likely a wiring problem or the ECU may be faulty. How to Test a Voltage Regulator. The usual alternator failures have to do with worn brushes inside the alternator, or a broken field wire between the regulator and alternator. Would it hurt anything to put in the exciter wire if it was meant to work without it?. • S is used by the regulator to monitor charging voltage at the battery. Problem with Lincoln Ranger 8 - no output Not up to procuction work on Flashing is a procedure to "recharge" the residual magnetism in the exciter. quite common for the alternator load management wire to break which stops the. Buy Generator Alternator and get the best deals at the lowest prices on eBay! Great Savings Free Delivery / Collection on many items For parts or not working. The third position is the ‘start’ mode where you exert key pressure to actually fire the engine up. 4 and started the car. OK, now I know its the alternator. Posted in MEP016D Generators and Parts, Support and Troubleshooting, Yanmar | Tagged Wiring 3 Comments FAQ , MEP002A , MEP003A , Support and Troubleshooting How To Break-In a New Re-manufactured Engine or a New Refurbished Generator from GMG. (And therefore this “tech feature” is in no way an attempt to “bash” the ONE-WIRE alternator system. And the alternator is charging just fine, but the Perfect Pass is not working, so I will trouble shoot that tomorrow. I also do not have power at the crank fuse either. This last trip things went bad again, so I stopped and shutdown the engine. With 110 VAC house wiring, the white wire is neutral, the green wire is "ground," and the black wire is "hot," carrying the electricity. There are no existing wires run to the two voltage regulator terminals on the alternator. 18 Calculate the speed of a 4. Yet no luck. Give them a slight tug and make sure they are completely seated in the connector. That said, I understand what you mean and you are right. Richpin demonstrates how to test an alternator with a standard multimeter. Through the use of the alternator, which is a dynamo, your car generates its own electrical power and stores it in a rechargeable car battery. This is an important area that might have been troublesome for a lot of people, if not for the ONE-WIRE. This is another reason of many why you should make sure your water pump is always in good working condition. Either the regulator simply shorted out internally (or from a serious external short), or adequate water supply was not present to keep the regulator cool. Yamaha DT100 DT 100 Electrical Wiring Diagram Schematic 1974 to 1983 HERE. Sensor wire to positive battery post. I would start by checking the wires on the starter motor and alternator to make sure they are sound then remove the no-charge wire off the alternator and putting a wire from that to the battery with a 100ohm resistor inline, then start the car and test the voltage across the alternator output. Tuff Stuff has dedicated charge wires that are large enough to carry the amperes, and have high-quality, crimped-on brass connectors. It has cost us, not only car rental fees taxi fees and towing fees, but the uncertainty of safety on the road. leave wire unhooked and engine should shut down with key switch. Fixing them might restore functionality to normalcy. Alternator was replaced with a new Hitachi unit 8 months ago. 34v at battery, 12. charging system is not working correctly is the battery-charging? What does a voltage regulator sense if it decreases the current to. Installed a Painless wiring harness and the alternator is not charging the battery. The stock cluster does not work properly and the alternator would not charge. The usual on that is the exciter wire and components in side of it not working right-loose wire happens a lot, voltage regulator is out on one side or the other, your alternator will not throw a charge until it gets above +/- 1500 rpm, and it's easy to chec, voltage handheld and watch the output. Loss of field or excitation can be caused in the generator due to excitation failure. There are other options* to disable Module power when engine is not running if no YELLOW lighting wiring is available. Can someone please advise what the smaller wire connected to the alternator on my daughters 2002 Clio II 1. To charge the battery the alternator has to have a live exciter wire. I believe if you don't connect this wire correctly it will not charge the system. Ensure warning light circuit is not down to earth 4. “Three wire” is an industry term that describes a situation that in most cases can be accomplished using only two wires [the. The other end of the alternator light is connected to an ignition positive. Peugeot 206 2002, battery charge fault? I had issue with the car battery about 10months ago so had new battery then after few months had new alternator fitted. I also question your replacing the voltage regulator, as it should probably be inside the alternator instead of a separate item. There is no transportation to the eBook shop. A mate was working on the car with me when he tried to start it when the earth to the Motor wasn't attached correctly but it doesn't seem to be a blown fuse (all other accessories work well, starter cranks fine too). battery/alternator or fuse/relay problem there's only a few reasons why it's not putting out. Three wire operation is as your vehicle’s original manufacture intended and assures that the alternator is switched on anytime the engine is running. But it happens. 4 with engine running. I got the kit(s) from www. However, here is the weird part: With the EXC wire disconnected at the alternator, I can put a test light on the end of the wire and to the battery negative. With 110 VAC house wiring, the white wire is neutral, the green wire is "ground," and the black wire is "hot," carrying the electricity. New alternator ($410 installed, ouch) and all is well. 8 When the exciter wire is not functioning the volts drop to 1. BMW Sensors Problems and Faults. It's because of a couple things: The battery is very dead and the alternator cannot put out enough power at idle RPMs to run the whole system and charge a battery. I disconnected the "exciter wire" and everything works fine, including the alternator, but why does it work ?. 02B CUa41a FP544a. Sometimes the alternator will not excite until a certain engine RPM. An alternator or AC generator is an electrical machine which converts mechanical energy into alternating electric energy. Problem: No warning light Possible causes: 1. Many translated example sentences containing "exciter excitation" – Dutch-English dictionary and search engine for Dutch translations. Specifically check the Blue Exciter wire behind the alternator. This leads to a lack of power which may kill one or more systems most likely the spark "ignition" system since this takes the most power and is necessary to run the car. CE has not informed me of a retail price as of yet, either. that was not working ,I have fixed it. Pierce the insulation on the same wire (with a pin) or back-probe the wire in the connector. Once the voltage regulator turns on, the alternator will remain on and charging until the engine comes to a complete stop. Ensure that it is earthed properly and stick an AVO on the exciter to see if you're getting any voltage. on the two wire plug one wire will have voltage all the time, this is the "sample" wire where the regulator reads the system voltage to adjust the output, the second wire. Yamaha CT2 175 Electrical Wiring Diagram Schematic 1972 HERE. You can diagnose the entire harness for this exciter wire, or maybe just wire up a very simple bulb/wire setup to satisfy the exciter circuit. Two wire means that you use the main battery wire to the back of the alternator and also ignition wire to the #1 terminal to activate the alternator. Took alternator to a rebuilder who said it was fine but was not getting exciter. Verify operation of remote control panel and that wires are not shorted to ground. Basic wiring diagram to , replace the alternator and the exciter wire pigtail. If not, check the wiring to the start solenoid. While I've been careful, the alternator does look pretty grimy. It was not wired with an exciter wire, so I presume it is meant to be the one wire kind. Initially, alternator failure may not cause any symptoms since a vehicle’s battery has some reserve power, but eventually, the reserves are depleted and accessories like the radio and air conditioning will stop working.