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ford alternator problems

General Tech Talk

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ford alternator problems

Post by built4thrashing »

i recently did an alternator upgrade to the sierra and are having a few problems with it. The alt is from a ford EF falcon. and is 110amp.


the problem is when you apply a heavy load on it it shuts down and wont charge. it will run the engine and thermo and radio at low volume but as soon as you up the radio or turn on the spot lights it shuts down and the batteries get drained. what would cause this and how can it be fixed?

Thanx B4T
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Post by Beastmavster »

Sound slike the alternator is farked. Or maybe connected up back to front?

Testing the alternator while it's attached but not disconnected would help.


Since I seem to be failing alternator 101 anyway (see other thread) I'd say ask someone else.
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Re: ford alternator problems

Post by Guy »

built4thrashing wrote:i recently did an alternator upgrade to the sierra and are having a few problems with it. The alt is from a ford EF falcon. and is 110amp.


the problem is when you apply a heavy load on it it shuts down and wont charge. it will run the engine and thermo and radio at low volume but as soon as you up the radio or turn on the spot lights it shuts down and the batteries get drained. what would cause this and how can it be fixed?

Thanx B4T
Sounds like an exciter is farked or you not "exciting" it

(can you post a pic of how you have it wired up ??)
" If governments are involved in the covering up the knowledge of aliens, Then they are doing a much better job of it than they do of everything else "
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Re: ford alternator problems

Post by simkell »

love_mud wrote:
built4thrashing wrote:i recently did an alternator upgrade to the sierra and are having a few problems with it. The alt is from a ford EF falcon. and is 110amp.


the problem is when you apply a heavy load on it it shuts down and wont charge. it will run the engine and thermo and radio at low volume but as soon as you up the radio or turn on the spot lights it shuts down and the batteries get drained. what would cause this and how can it be fixed?

Thanx B4T
Sounds like an exciter is farked or you not "exciting" it

(can you post a pic of how you have it wired up ??)



yeah i agree sounds like it isn't exciting
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Post by -Scott- »

What does the charge light on your dash indicate?

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Post by built4thrashing »

charge light on the dash doesnt work on this alt. did on the old one.

the alt has a battery wire and 2 others. one is connected to the battery as a voltage indicator wire and the other i think is conected to the dash light.
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Post by chimpboy »

How did you wire it up, compared to the original one? Either the alternator is r00ted or you have just hooked it up wrong, I reckon.
This is not legal advice.
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