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Old 01-28-2003, 04:18 PM
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Post Alternator Not Charging

I have a 91 Chevy Truck with a 350. My alternator will not charge at all. It has been replaced 2 times at the parts house, the large stud on the back of the alternator does have 12 volts going to it, but there is no charge coming out of the alternator. There is only one other wire coming out of the alternator, I am assuming it is going to the gauges. I have checked the fusible links from the battery to the wiring terminal and from there to the starter. Even removed the starter wires while it was running to see if there was a short there. I know the Alternator is good it was tested on the bench with a lode PLEASE HELP I am about to get mad and set the whole thing on fire, well not that mad but just stumped <img src="confused.gif" border="0">

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Old 01-28-2003, 08:26 PM
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You mite try a different battery. I have seen batteries that would not accept a charge from the alternator, making you think the altinator was at fault. Also check all your connections. If you have another car change the batteries out. If not take the battery to the parts store for a free check.
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Old 01-28-2003, 10:36 PM
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I had the Batt checked it was fine. Also i hookes 12 V up to the brown wire going into the alternator, and it still does not charge.
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Old 01-29-2003, 05:35 PM
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The small wire going to the alt. is from the key, not to the gauge. There should be 12 volts on that wire with the key on. This wire is called the field wire as indicated by the "F" on the connector of the alt. This prevents the battery from back-feeding through the alt. and killing it when the key is off.
A quick way to see if an alt. field is "ON", is to take a screwdriver and touch the shaft on the rear of the alt with the engine running. If you feel a small magnetic pull, that means the field is "on".

Good luck

[ January 29, 2003: Message edited by: xtreme off-road ]</p>
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Old 01-29-2003, 07:03 PM
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If you know for a fact that the alternator(assuming internal regulator) and battery are good, the only other thing I can think of would be a defective wire in the circuit. I would get a volt ohm meter and check each wire for continuity while you are wiggleing the wires.
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Old 01-29-2003, 07:09 PM
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If all else fails, try contacting al@autorewire.com. He is a specialist in automotive electrical problems.

Let us know when you figure out what the problem is.
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Old 01-31-2003, 04:53 PM
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Thanks everyone i found it. Thought i had it fixed once but it was still shorting with the VSS wire sending to the speedometer It would charge while not moving, but once rolling it would stop. But i have it working now Thanks for the help and ideas.
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