Alternator to Computer b/w wire
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Alternator to Computer b/w wire
Before I wrote this... I've studied my books, Mitchell data, searched the web - I even went to the Ford dealership. For the last two hours I've searched through the forums. Here's my question: On a 1985 Ford F150 w/ 5.0L EFI using a G1 alternator and externally mounted voltage regulator; there is a black/white wire coming from the stator (S Connection) on the alternator. The schematics I have show this connecting to the engine's computer (at no. 12 or 11....) What is the purpose of this connection? Is it necessary? This extra wire showed up after an engine swap. The truck is running fine except that the battery is being overcharged.... I hate the idea of just replacing the voltage regulator and taping up the b/w wire. Anybody know anything about this? Thanks!
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From: Virginia
I can't find that wire on the EFI schematics I have. I can find it on a 5.8 diagram, because it has a computer but still has the carb too. It goes to the choke.
On pin 11 on a EFI computer, there is a white/black(not black/white) that goes to the air management solenoid.
I can't find anything connected to pin 12 on your model. It's an injector wire on sequential injection computers.
On pin 11 on a EFI computer, there is a white/black(not black/white) that goes to the air management solenoid.
I can't find anything connected to pin 12 on your model. It's an injector wire on sequential injection computers.
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you can see it in the schematic on the autozone site Dave.
Diagram #18
http://www.autozone.com/az/cds/en_us...rInfoPages.htm
Diagram #18
http://www.autozone.com/az/cds/en_us...rInfoPages.htm
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From: Virginia
I looked at diagram #18, and it's for a carbed engine.
What they did when they made that diagram, is they took a quick look at the factory diagram like the one in the Haynes manual, and assumed since the factory diagram says "to connector eec" they assumed it goes to the computer. From what I can tell, it goes to a connector common with the eec wires, but the wire does not go to the eec, it goes to the choke wire, which must be hooked in the same connector as the eec wires, but does not go to the eec computer.
What they did when they made that diagram, is they took a quick look at the factory diagram like the one in the Haynes manual, and assumed since the factory diagram says "to connector eec" they assumed it goes to the computer. From what I can tell, it goes to a connector common with the eec wires, but the wire does not go to the eec, it goes to the choke wire, which must be hooked in the same connector as the eec wires, but does not go to the eec computer.
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Thanks for the answers. Replacing the voltage regulator fixed the overcharging problem. I'm also adding a ground strap to the alternator... When I decided to put a Lincoln engine in, I figured I'd have to do a little troubleshooting...
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