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by amills2 on March 12th, 2006

amills2

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Even after replacing the alternator, one of the two batteries and the wires, my 1973 F250 isn't holding a charge. What could be wrong?

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Answers. 2 helpful answers below.

  • by GingerL on June 5th, 2006

    GingerL

    The most likely cause of this problem is a faulty voltage regulator.

    Newer charging system almost always use a regulator that is integral with the alternator, but yours (and most anything of that vintage) is a seperate part. On this vehicle, the regulator is a small metal box located somewhere along the inner fender or on the firewall.

    Since this controls the voltage in your charging system, it could keep the system from charging properly, even with a perfectly functioning alternator.

    Most chain auto parts stores have the ability to test your charging system curbside. However, they may not be able, depending on the equipment used and experience of the tester, to pinpoint a faulty voltage regulator.

    Although parts-swapping is not usually the best way to diagnose problems, because this part is relatively inexpensive and easy to change, it may be less hassle to just swap it out and see if that fixes the problem. Just be aware that it won't be returnable.

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  • by Joe-Speedy on March 18th, 2006

    Joe-Speedy

    Replace the other battery and then check. If that isn't it, look for a fault in the grounding circuit.

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