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Old 07-07-2006, 04:03 PM   #1
Sphinx
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Question Electrical

hey i don't know what is wrong with my 1989 supra for some reason it drains my battery overnight and can't find out what it is can any one point me in the right direction please.
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Old 07-07-2006, 10:43 PM   #2
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Bad ground somewhere. How do you know its draining the battery?
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Old 07-08-2006, 01:51 AM   #3
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Talking reply to: How do you know its draining the battery?

i know because i can't started it in the morning and thats why
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Old 07-08-2006, 02:56 AM   #4
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Wink Try this

Bad grounds don't drain batteries. Things that are grouded do. Like interior lights left on. Brake lights staying on. Radios, amps, etc on when key is off.

Since its draining over night, AND if the battery is a real good one (because a weak battery won't hold a charge over night anyway), then you have a pretty big draw.

With the car OFF, remove the Neg battery terminal and place a mechanics test light between the terminal and the battery post. A VOM will work too. If the light shines BRIGHT, then you have a big draw. A 1 volt draw is OK.

If it does not shine, or is very dull, then there is no draw, or just a very small one. It is common to have a very small draw.

If there is a big draw, you can pull one fuse at a time to see what circuit is the problem. Hopefully you find it and can then trace the circuit down and fix it. Other wise you'll end up having a shop do it.

Have the battery and charging system checked. An alternator that is weak won't keep the battery fully charged.

Sometimes working on these troubles can cause you to go bald !!
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