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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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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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Not charging battery alt meter reads 11.49 wont go higher


In case battery is Bad. Stop Engine
Try a substitute Battery... Just use Jumpers Cables with main battery disconnected. Restart
If no change in Voltage (should go up to 13.8 to 14Volts) then your Alternator is Bad. (Belt Not Slipping?)
The Voltage regulator is usually built into the Alternator these days. So...Remove Alternator.
Either Repair it.
Place in Vice. Mark the case next to the screws with a scratch so it lines up on re assembly. Undo screws & Separate.
Faults Usually - Brushes, Diodes or Regulator
Check Brushes are not worn down too far to make contact.
If replacing brushes you will need to make a brush hook to hold brushes back on reassembly. Look for small hole to insert brush holder until both halves are back together.
or Get a Rebuilt one with warranty.

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did you check that battery is charging with a multi meter ? could be that your alternator has a fault . Icheck battery voltage with engine off and running , voltage should be approx. 12.48v with engine off and around 14v running . if no increase in voltage when running brushes in alternator will need replacing .

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1 Answer

Won't hold a charge. Have had Alternator and Battery tested. I know I need a fuel pump. Is the fuel pump electric and is it in the gas tank? Lights are very dim. I charge the battery everynight. ...


If the lights are dim when the car is running, it is not charging well. Who tested the alternator? Is the alternator well grounded to the engine? I think those older alternators required a ground strap around the alternator mounting.
Though I suspect the problem is not a drain, the way to find the drain on this car is to disconnect one battery cable and put a voltmeter between the cable and the battery terminal. If it is draining, you will see 12.6 volts on the meter. If you see only 3 or 4 volts, it is not draining.
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This is one of those problems that you might not think of right away, and it will drive you out of your mind. ALWAYS check this fuse before replacing a battery or an alternator on a mid to late '90s Model Thunderbird. You will save time, money, and you won't pull out your hair.

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