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How much voltage does a 65 series battery hold.

The alternator went out and the batteries drained.Replacing the brushes on the alternator and charging the old batteries the voltage reached 12.90 on the right side (passenger side) and the other battery wouldn't take a charge.After replacing the battery with a used 65 series battery which was charged at 10 amps for 12 hours it charged to 12.57 volts and is not enough voltage to start the diesel engine.The minimum voltage in the past had been 13.80 or better.all the way to 15.00 volts.Is the replacement battery just too used?Or maybe charged longer/2 volt trickle charge for 24 hours or so?Please advise

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SOURCE: 84 CK TRK, 2500, 5.7L 55,000 miles have replaced

On some of the older style GM's you can take that brown wire and cut it and take the end leading from the alternator and hook it directly to the hot terminal on the alternator and just leave it hooked up and it will work. But I have ran into the occasional problem where leaving it hooked up will drain the battery when the vehicle isn't running. Hope this helps..

Posted on Oct 25, 2009

Testimonial: "I fixed the problem - the terminal at the brown wire was corroded - after cleaning and recrimping - everything works - thanks for the heads up"


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