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Old 07-14-2011, 02:40 PM
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Battery drain-1963 Impala

I have a 1963 Impala with a battery drain problem.

I disconnected the neg cable from the battery and put a volt meter between the neg cable and the neg post on the battery, I get a drain of 12.5 volts.

Next I pulled all the fuses in the fuse box _____ still 12.5 volt drain
Disconnected all the wires on the alternator ___ still 12.5 volt drain
Unplugged the solid state voltage regulator ___ still 12.5 volt drain
Hooked everything back up and started he car, then pulled both battery cables off the battery and the car kept running, this should mean the alt. is good.

Should I check the
Coil
Starter
Solenoid
Ground wires --->I only have 1 on the back of the engine to the firewall.
And of course the one from the battery to the block.

HELP---------------HELP
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Old 07-14-2011, 03:19 PM
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Disconnect the large red wires, one at a time measuring voltage each time, from the horn relay and ext voltage regulator...... both have been known to short out internaly etc....
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Old 07-14-2011, 03:49 PM
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Voltage regulator is brand new (wells VR715)
So the horn relay could be shot?
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Old 07-14-2011, 04:04 PM
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I went out and disconnected the horn relay and the problem is gone.
NEED A NEW HORNRELAY
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Old 07-14-2011, 04:36 PM
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Well maybe, The large wires on the horn relay are connected together by a solid piece of metal or a buss bar, one of the wires goes to the alt the other goes to the factory splice then the fuse box firewall pass thru etc....... temp clamp the two red wires together and see if you still have the drain.... if you do check and make sure the horn button is not shorted in the steering column (common problem).
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Old 07-14-2011, 04:51 PM
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The test you made in your first post won't help find your drain problem. If you are looking for load you need an ammeter in the circuit, not a voltmeter. Putting a voltmeter between ground and the negative terminal is just measuring the voltage of the battery.

Also, don't pull the cable off the battery when its running, unless you want to risk damaging the alternator.

When you disconnected the horn relay, what problem was gone? What quit happening or started working differently?

Bruce
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Old 07-15-2011, 07:06 AM
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When I disconnected the horn relay the voltage drain stopped.
I will recheck everything using amp gauge.
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Old 07-15-2011, 07:57 PM
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Quote:
Originally Posted by 75gmck25
The test you made in your first post won't help find your drain problem. If you are looking for load you need an ammeter in the circuit, not a voltmeter. Putting a voltmeter between ground and the negative terminal is just measuring the voltage of the battery.

Also, don't pull the cable off the battery when its running, unless you want to risk damaging the alternator.

When you disconnected the horn relay, what problem was gone? What quit happening or started working differently?

Bruce
Correct

Posted by impalaman63 "I disconnected the neg cable from the battery and put a volt meter between the neg cable and the neg post on the battery, I get a drain of 12.5 volts."

That could be showing the path of the clock, all things go to ground and something as small as that will give a 12 v reading using volts as the test.


Amp is a much better trouble shooting parameter, you will still hook the meter up as you did just use the amp scale.
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