alternator wiring
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Freshman User
Joined: Feb 2004
Posts: 49
Likes: 0
From: Denton, Texas
alternator wiring
Tomorrow night I hope to fire up my 390 for the first time. Can someone confirm that I've wired my alternator correctly? My truck is a '71 F100.
The cable has a heavy black wire, a smaller orange wire, and a black plastic piece with a ground tab on it.
There was also a badly damaged individual wire that I threw away.
I connected the ground tab to the terminal on the alternator marked "GRD".
I connected the heavy black wire to the terminal marked "STA," which had a black insulating ring around it.
I connected the orange wire to the terminal marked "FLD," which had an orange insulating ring around it.
I connected the remaining red terminal on the alternator, marked "BAT," to the positive terminal on the battery.
Please confirm this is correct, or advise. Thanks for the help!
The cable has a heavy black wire, a smaller orange wire, and a black plastic piece with a ground tab on it.
There was also a badly damaged individual wire that I threw away.
I connected the ground tab to the terminal on the alternator marked "GRD".
I connected the heavy black wire to the terminal marked "STA," which had a black insulating ring around it.
I connected the orange wire to the terminal marked "FLD," which had an orange insulating ring around it.
I connected the remaining red terminal on the alternator, marked "BAT," to the positive terminal on the battery.
Please confirm this is correct, or advise. Thanks for the help!
Thread Starter
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Freshman User
Joined: Feb 2004
Posts: 49
Likes: 0
From: Denton, Texas
resurrecting this question
I posted another question in this forum because my battery keeps dying.
I wonder if I have the alternator wired incorrectly?
Maybe someone could look at his or her alternator and confirm that mine is wired correctly?
I wonder if I have the alternator wired incorrectly?
Maybe someone could look at his or her alternator and confirm that mine is wired correctly?
Junior User
Joined: Jan 2004
Posts: 54
Likes: 0
From: syracuse, kansas
Black w/red stripe = ground
lg black to battery
orange = field
white w/black stripe = sta.
voltage reg wiring
far left idiot lite
2nd from left batt
3rd from left sta or white w/ black stripe
far right field or orange
lg black to battery
orange = field
white w/black stripe = sta.
voltage reg wiring
far left idiot lite
2nd from left batt
3rd from left sta or white w/ black stripe
far right field or orange
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Freshman User
Joined: Aug 2004
Posts: 36
Likes: 0
From: Kensington, OH
F-100 wiring
I think you have things pretty much where needed. According to the wiring diagram i have, G - Black/red stripe, FLD is orange, B is Black, STA is White/Black stripe.
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Thread Starter
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Freshman User
Joined: Feb 2004
Posts: 49
Likes: 0
From: Denton, Texas
Fixed - Thanks for the help!
Well, knock on wood, but I think it's fixed.
I spent some quality voltmeter time with it and determined that two miracles had occurred:
1) it ran at all.
2) it didn't burn to the ground.
I unwrapped a lot of wire before I found any traces of a red stripe on that black wire, so that had been confusing me. The other key was that the STA terminal isn't used on my truck due to the factory gauges. I had assumed that the truck would be wired the same way as my mustang, but the mustang had no factory gauges.
Now it's reading >14V at the battery with the engine running.
I also spent some time replacing terminals and wiring (soldered all splices and crimps) and rewrapped that part of the harness.
For future reference by anyone else reading this thread, the voltage regulator is labeled to somewhat match the alternator. F = FLD, S = STA.
I spent some quality voltmeter time with it and determined that two miracles had occurred:
1) it ran at all.
2) it didn't burn to the ground.
I unwrapped a lot of wire before I found any traces of a red stripe on that black wire, so that had been confusing me. The other key was that the STA terminal isn't used on my truck due to the factory gauges. I had assumed that the truck would be wired the same way as my mustang, but the mustang had no factory gauges.
Now it's reading >14V at the battery with the engine running.
I also spent some time replacing terminals and wiring (soldered all splices and crimps) and rewrapped that part of the harness.For future reference by anyone else reading this thread, the voltage regulator is labeled to somewhat match the alternator. F = FLD, S = STA.