ALTERNATOR WIRING QUESTION
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From: Virginia
Get a GM alternator with the regulator built into the alternator itself. That one is very easy to hook up. That's the later GM style alternators(I know they made them in 1979 up to around 1986). The earlier GM alternators had the external regulator.
If you have the internal GM alternator, take the Ford red/green wire off the Ford regulator, and hook it to terminal #1 on the GM alternator.
Make a small jumper wire and hook terminal #2 on the GM alternator to the large output post on the GM alternator.
Hook the large output wire that went to the Ford alternator to the same large output terminal on the GM.
That's it. I just did this on a 86 Ford Ranger and it works well. I did have to modify the brackets though.
If you have the internal GM alternator, take the Ford red/green wire off the Ford regulator, and hook it to terminal #1 on the GM alternator.
Make a small jumper wire and hook terminal #2 on the GM alternator to the large output post on the GM alternator.
Hook the large output wire that went to the Ford alternator to the same large output terminal on the GM.
That's it. I just did this on a 86 Ford Ranger and it works well. I did have to modify the brackets though.
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Elder User
Joined: May 2006
Posts: 572
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From: Sacramento area
Thanks Dave,
My rewiring is not factory color coded. So, is the red/green wire on regulator
the wire thats hooked to the S or the F terminal?
Also, Do I just leave the other wires in place on the regulator
Thanks again Dave
Gary
My rewiring is not factory color coded. So, is the red/green wire on regulator
the wire thats hooked to the S or the F terminal?
Also, Do I just leave the other wires in place on the regulator
Thanks again Dave
Gary
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Joined: Jan 2001
Posts: 56,977
Likes: 2,733
From: Virginia
The red/green is the 12v signal from the keyswitch that triggers the system to go online and get ready to charge.
Ford had two different ways they wired their charging systems, and the red/green trigger wire was either on the "i" terminal on the regulator or the "s" terminal. If you do not have a wire on the "i" terminal, then you have the "s" terminal wiring and that's the wire you want. You can also get a meter and hook it to this wire, and you should get voltage on this wire when you turn the key to run.
As far as the wires and the old regulator that is left over, you can just leave it there, or you can unwrap the harness and take the wires out and take the old regulator out. You will have the "f" wire leftover that went from the old regulator to the old alternator, and you will have a yellow wire going from the "a" terminal to a 12v source. If you leave the yellow wire in the harness, but take the regulator out, make sure you tape the yellow wire off.
Ford had two different ways they wired their charging systems, and the red/green trigger wire was either on the "i" terminal on the regulator or the "s" terminal. If you do not have a wire on the "i" terminal, then you have the "s" terminal wiring and that's the wire you want. You can also get a meter and hook it to this wire, and you should get voltage on this wire when you turn the key to run.
As far as the wires and the old regulator that is left over, you can just leave it there, or you can unwrap the harness and take the wires out and take the old regulator out. You will have the "f" wire leftover that went from the old regulator to the old alternator, and you will have a yellow wire going from the "a" terminal to a 12v source. If you leave the yellow wire in the harness, but take the regulator out, make sure you tape the yellow wire off.
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