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Old 04-17-2011, 03:07 PM
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Draining Battery

Hello All
Hey on my 41 dodge with a 302 I can watch the volt meter go from 12 volts to 0 volts as soon as I turn on the key.Don't have to try to start it ,just turn the key on . Also the starter doesn't sound to good ,so could my starter be the voltage problem ?
I have always a problem keeping the battery charged ,if the car sits a couple days the battery goes dead. I think that may be a bad battery , would a bad battery cause the severe voltage drop ??

Jeff mc

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Old 04-17-2011, 03:09 PM
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Sounds like you have a constant drain somewhere. What all test have you done at this point ?

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Old 04-17-2011, 04:26 PM
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If your volt meter is instantly going from 12v to 0, you either have a severe dead short, which would likely cause a fire.........the volt meter is hooked up wrong ......or a bad volt meter.

Since we are not seeing heat and fire, I suspect it is one of the other two.....

As for draining the battery over a few days, yes you likely have a drain on the battery
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Old 04-17-2011, 04:33 PM
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I suspect a drain on the battery, but I a also think the battery is shot now.
Put a test light between the negative cable and the negative post. If it glows or lights up, with everything off in the vehicle then you have a drain. Pull fuses one at a time and when the light goes out , you have found the circuit that is causing the trouble.
If no lights go out , unhook the alternator and see if it goes out. You need to unhook the battery (large wire) from the post as well as unplugging the plug.
When you find the affected circuit, you can disconnect things on that circuit one at a time to find wich device is the problem.
Not too many live circuits on a truck that old, at least with the key off.
Brakes, E flashers if equipt, horn , headlights and alternator have power to them with the key off.Cigar lighter to (not that you have one)
I would start with the alternator myself.
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