Car battery

Tiny
ASPENITE
  • MEMBER
  • 1991 OLDSMOBILE CIERA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 142 MILES
I've gone through all the checks for the battery system but all are right what else would cause the battery to drain over night?
Monday, February 21st, 2011 AT 5:30 PM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
You have to be sure the battery has a full charge or you can't do any testing. Check the charging system also.

If you have an excessive drain with everything turned off. Check for a lite staying on, best time to check is in the dark, trunk--underhood-- interior. You can take battery cable loose, use a testlite between cable and battery post, if lite come on birght, you have a drain. If the drain is on a fused circuit, you can pull/replace fuses one at a time, when you pull the fuse on the faulty circuit, the lite goes out.
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Monday, February 21st, 2011 AT 5:40 PM

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