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GM 3 wire diagram

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slideways

07-17-2007 10:02:27

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Finally got the old beast running again but now i have to attack the charging system. Currently i have a 6v original generator that isnt hooked to anything putting out 12-14v or so (according to a multimeter) but i got a working 3 wire GM alt from a junkyard. I need a diagram or writeup on how to hook that up now. The TE20 is all 12v at this point and negative ground.

Thanks!

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Lance J.

07-18-2007 13:35:53

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Re: GM 3 wire diagram in reply to slideways, 07-17-2007 10:02:27

It seems to me that the easiest thing would be to take the 3 wire alternator to an auto electrical shop and have it converted to an internally regulated one wire alternator. I bought an off the shelf one wire alternator from O'Reiily auto parts for my '55 TO-35 and am very happy with it. It was only 70 bucks or so with a core. I can get you the part # if you are interested.

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John (UK)

07-18-2007 11:16:18

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Re: GM 3 wire diagram in reply to slideways, 07-17-2007 10:02:27

We can't send you anything because we don't have your email address, so if you need a diagram email me at:- fergusontractors(at)tiscali.co.uk tell me again what you need and what the Tractor is and what type of Alternator you are using, (a single wire or 2 or 3 wire type) and I can send it to you....John

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phil(va)

07-18-2007 10:46:09

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Re: GM 3 wire diagram in reply to slideways, 07-17-2007 10:02:27

Slide, I think you are not getting an answer to your post because it is kinda confusing as to what you want. I know some people have 12 volt diagrams with 3 wire alts, if that is the question. In fact, you should be able to find that by searching the archives. When you say you have a 6 volt genny putting out 12-14 volts, that confuses me. Are you also asking if you should use the junkyard alternator in place of the genny? Why did you get the alternator? Does the genny not work?

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Gerald J.

07-18-2007 20:27:37

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Re: GM 3 wire diagram in reply to phil(va), 07-18-2007 10:46:09

Without a regulator its easy for a 6 volt generator to put out 12 volts. Just turn the shaft fast enough.

And a 3rd brush generator has no voltage regulator, the third brush makes it self current regulated and its voltage can rise as high as 12 volts when running fast enough.

Gerald J.

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slideways

07-19-2007 07:33:12

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Re: GM 3 wire diagram in reply to Gerald J., 07-18-2007 20:27:37

Ok sorry about the email thing.. its there now. I knew the 12-13v thing seemed strange but i know when we checked it it was putting out a high number (we thought)but since its unregulated it doesnt suprise me. I was going to do the 1 wire style but i learned that they only charge over 3000rpm or so which my tractor never sees.

So im assuming to just charge a normal 12v battery from the alternator for a diagram. I just need to know what wires go where and if there needs to be any regulator or diode/fuse etc.. in there anywhere. Im terrible with electrical so i hope i can pull this one off.

Thanks again!

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Gerald J.

07-19-2007 09:39:15

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Re: GM 3 wire diagram in reply to slideways, 07-19-2007 07:33:12

I have a one wire alternator on my JD4020. I bought the smallest diameter wide pulley through my local auto electric shop. It takes about 1650 crankshaft RPM to start the alternator, then it charges well as slow as the engine will run.

Rotating machinery with varying speed always needs a voltage regulator. Its most convenient if its inside the alternator. This attached photo nearly always pops up as the answer to your question about how to wire it and it is fairly clear. You need the diode or the resistor or the idiot light on that wire that powers the regulator initially, or a separate contact on the ignition switch otherwise the alternator will back feed the ignition through that wire and you won't be able to shut the engine down with the ignition switch.

Gerald J.

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