Mystery Draw on Battery - Team Camaro Tech
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post #1 of 6 (permalink) Old Aug 21st, 09, 01:05 PM Thread Starter
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Mystery Draw on Battery

I have noticed my battery seems a little tired when starting, but its a brand new battery. I put a tester on and found a 3/4 Amp constant draw on the battery, even with all of the fuses pulled - even the flaser. Any ideas on where this could be coming from would be huge.

68 RS/SS 350 4Spd
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post #2 of 6 (permalink) Old Aug 21st, 09, 02:28 PM
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Re: Mystery Draw on Battery

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Originally Posted by blumarln View Post
I have noticed my battery seems a little tired when starting, but its a brand new battery. I put a tester on and found a 3/4 Amp constant draw on the battery, even with all of the fuses pulled - even the flaser. Any ideas on where this could be coming from would be huge.

68 RS/SS 350 4Spd
I just had the same problem....for me it was the external Voltage regulator (69 Camaro) the part was still avail. from A/C Delco...$100can.
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post #3 of 6 (permalink) Old Aug 21st, 09, 04:30 PM
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Re: Mystery Draw on Battery

Yep, ext regulator or alternator - unplug the BAT terminal to make sure the alt is good.
And you're sure any Convenience lighting installed, if equipped, is off?
Glovebox light, engine bay light, trunk light.

You might look/unbolt the junction block next to the battery as the back side is open and I have seen rust build up and become a resistance path to ground.

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post #4 of 6 (permalink) Old Aug 21st, 09, 04:52 PM
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Re: Mystery Draw on Battery

Could be the diodes in the alt. as well.

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post #5 of 6 (permalink) Old Aug 21st, 09, 07:26 PM
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Re: Mystery Draw on Battery

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Could be the diodes in the alt. as well.
Yup, forgot to mention...i rebuilt the Alt. as well...just to be safe and cleaned up all the Grounds.
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post #6 of 6 (permalink) Old Aug 22nd, 09, 11:50 PM
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Re: Mystery Draw on Battery

So your diode tree checks good then? That's usually what fails when an alternator starts leaking current. Also, if you assemble the electrical parts incorrectly you can wind up with a ground short or leak.

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