C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Help how do I go about finding a battery drain?

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Old May 18, 2003 | 03:07 PM
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St. Jude Donor '03-'04-'08-'09
Default Help how do I go about finding a battery drain?

What tools and where do I start? It's driving me crazy!! :crazy: :(
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Old May 18, 2003 | 03:15 PM
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Default Re: Help how do I go about finding a battery drain? (Mr. Magoo)

I think you need a test light. A voltmeter would also work well. Set it up between the ground cable and the neg battery terminal. Unplug fuses until you find the culprit.
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Old May 18, 2003 | 03:27 PM
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Default Re: Help how do I go about finding a battery drain? (Mr. Magoo)

You will need to check amp draw with an ammeter. If there is significant amp draw, pull fuses until you find what circuit is drawing amps. If the culprit cannot be found in the fuse panel, there are several fusible links and other circuits that must also be checked.
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Old May 18, 2003 | 03:37 PM
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Default Re: Help how do I go about finding a battery drain? (jimswhite92)

You will need to check amp draw with an ammeter. If there is significant amp draw, pull fuses until you find what circuit is drawing amps. If the culprit cannot be found in the fuse panel, there are several fusible links and other circuits that must also be checked.
Thanks guys.

Where can I buy a Ammeter? Does it just hook up to the battery terminals?
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Old May 18, 2003 | 04:13 PM
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Default Re: Help how do I go about finding a battery drain? (Mr. Magoo)

Magoo... behind your battery (well to the right of it if you're looking at it) is a junction box with about 6 red wires going to it. All of these go to different systems in the car. One of them you will always have a tiny draw from because of the radio needing a hot 12v all the the time to keep its memory settings. If you undo the nut holding them all down you can test each one at a time for continuity or a draw.
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Old May 18, 2003 | 08:08 PM
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Default Re: Help how do I go about finding a battery drain? (scorp508)

Thanks Scorp I'll give that a try.
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Old May 18, 2003 | 09:42 PM
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Default Re: Help how do I go about finding a battery drain? (Mr. Magoo)

Your cars computer draws power all the time too I believe. It is not alot but some.
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Old May 18, 2003 | 09:51 PM
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Default Re: Help how do I go about finding a battery drain? (Ericthewolf)

Your cars computer draws power all the time too I believe. It is not alot but some.
Yep. That one is over by the (+) terminal on its own little weatherpack plug.
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Old May 19, 2003 | 09:46 AM
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Default Re: Help how do I go about finding a battery drain? (Mr. Magoo)

If your battery goes dead after a significant amount of time, this is normal. I had a problem on my 87 during winter storage, after 1 or 2 months the battery would be completely dead. After replacing several batteries ( is that ever a pain in the butt) I bought a trickle charger designed to keep a battery charged while not overcharging. When I'm storing the car for any length of time, I put the charger on, no more problems. Good Luck :chevy
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Old May 19, 2003 | 07:31 PM
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Default Re: Help how do I go about finding a battery drain? (sting ry)

If your battery goes dead after a significant amount of time, this is normal. I had a problem on my 87 during winter storage, after 1 or 2 months the battery would be completely dead. After replacing several batteries ( is that ever a pain in the butt) I bought a trickle charger designed to keep a battery charged while not overcharging. When I'm storing the car for any length of time, I put the charger on, no more problems. Good Luck :chevy
Well it goes dead after only 2 weeks without using the car. :(
The Vette is at the paint shop for the next few weeks, I'll go through it then. In the meantime I disconnect the battery every time I park it. :rolleyes:
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Old May 19, 2003 | 09:24 PM
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Default Re: Help how do I go about finding a battery drain? (Mr. Magoo)

If you have a digital dash check out the power supply. It would killmy battery in about 2 weeks!
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Old May 20, 2003 | 01:38 PM
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Default Re: Help how do I go about finding a battery drain? (Mr. Magoo)

Don’t forget the starter, and alternator. You can disconnect these items one at a time and monitor amp draw. Never know what could have happened in there.

:cheers:
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