Ford Alternator wiring...NEED HELP!!!

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May 10, 2007 | 10:28 AM

cbrew

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Joined: Apr 2007

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Ford Alternator wiring...NEED HELP!!!

I bought an '85 Bronco with a transplanted carb'd 302 (replacing the stock ,EFI?, 351). The previous owner told me it had a coil problem specifically it was burning coils out. I replaced the coil with the correct one. No more coil burn out. New problem...alternator not charging battery!?!?! The Bronc started fine after initial alternator replacement...the battery gradually went weak, ...weaker on every subsequent start (new battery, by the way).
I did the "shadetree" thing by pulling the correct cable and the engine died thus confirming a new alternator was needed. Having replaced the alternator, the battery still isn't getting a charge. I hooked up the wiring just like it was before I changed alternators which leads me to believe that the alternator wiring IS NOT correctly hooked up right. Can anyone find it in thier TRUE FORD BLUE heart to show me the correct way this thing is suppossed to be hooked up ? I have a schematic but it really doesn't help. I've searched to no avail to find which wire goes where. I am not familiar with Fords so your assistance is needed.

THNX

Last edited by cbrew; May 10, 2007 at 10:34 AM.

May 10, 2007 | 02:08 PM

Franklin2

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Joined: Jan 2001

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From: Virginia

Do you have an external regulator or an internal one? One thing you can check is to make sure you have voltage on the large output terminal of the alternator with the engine off. If you don't, there is a fusible link in this wire that is probably burnt out.

I am also trying to stamp out the practice of taking off the battery cable with the engine running. With older vehicles with little electronics, you could get away with it. With newer vehicles which have electronic ignitions, fancy radios, and fuel injection computers, it's too dangerous to pull the battery cable with the engine running. The alternator can run out of control with the battery cable off, burning up a lot of expensive stuff.

May 10, 2007 | 02:19 PM

Sport45

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Joined: Apr 2003

Posts: 2,058

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From: Too close to Houston

Quote:

Originally Posted by Franklin2

I am also trying to stamp out the practice of taking off the battery cable with the engine running. With older vehicles with little electronics, you could get away with it. With newer vehicles which have electronic ignitions, fancy radios, and fuel injection computers, it's too dangerous to pull the battery cable with the engine running. The alternator can run out of control with the battery cable off, burning up a lot of expensive stuff.

Franklin is dead-nuts on here. Never disconnect a battery cable while a modern (post generator era) vehicle is running. At the very least you'll fry your alternator.

Here's the wiring diagram you're looking for.

Autozone Link