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What's a normal amp draw from your battery?

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Old Aug 26, 2007 | 02:29 PM
  #1  
nb 96 z's Avatar
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From: canton, mi
Question What's a normal amp draw from your battery?

Well, I'm trying to figure out why my battery is dead. I went and got it tested and .5 amps is being drawn from the battery. Is that normal, or is it just because I havn't driven my car a lot? I've only put 400 miles on it since April.

I went on vacation for about 10 days, came back and wouldn't start. So I jumped it, and it was fine. Now I havn't driven it for about 4 days because nasty weather and same thing, battery is drained.

Just trying to figure out if that draw is normal, or if I need to start looking for a short and pulling fuses or just drive it more. Thanks.
Old Aug 26, 2007 | 02:38 PM
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Dave '97 Z28 M6's Avatar
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If everything is off, there shouldn't be any more than 20mA (0.02 amps) or so needed to keep power to the volitile memory in the PCM and stereo system presets/clock, etc.

You're right in thinking you'll have to start pulling fuses to find the current drain.

Bear in mind when you're diagnosing this that some circuits will use power for a few seconds when first connected, then shut down.
Old Aug 26, 2007 | 03:02 PM
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nb 96 z's Avatar
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Shoot. Is there a common place to start looking and do I check fuses in both the engine bay and inside the car? I know I'll be checking my electric water pump wires and exhaust cutout wires. Thanks.
Old Aug 26, 2007 | 03:33 PM
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Do you have aftermarket radio/amps/etc??????? Also check the map lights on the mirror... I accidently left it on before and it drawn down the battery...
Old Aug 26, 2007 | 04:08 PM
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nb 96 z's Avatar
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No aftermarket radio or amps. Yeah I've done that before too and I made sure they were all off.
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