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Old 06-08-2009, 12:07 AM   #1
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Default Need help finding battery drain

Have a 1988 Pontiac Bonneville SE 3800 V6 with 188,000 miles. AT, PDL, PW, cruise, etc. My battery is draining down after sitting over the weekend. Just put new alternator on. Battery is only a year old. My VOM shows ac voltage across the battery terminals when the engine is running. Always thought I should only get dc voltage. I pulled all the fuses and they don't show any drain. Anything else to check? Do I have to check all the wiring harnesses and wiring alongside the door moldings? Thanks, Gary
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Old 06-08-2009, 12:13 AM   #2
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What'* the voltage you are showing with the car running and off at the battery?

Clean both ends of the battery cable and put some dielectric grease on the connections.
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Old 06-08-2009, 12:17 AM   #3
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About 12.6v with engine off and around 14.2v with engine running. So alternator seems to be doing its job. Gary
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Old 06-08-2009, 12:26 AM   #4
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I've had new batteries go bad. Have it load tested. You might have a shorted cell.
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Old 06-08-2009, 12:30 AM   #5
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I'm taking the less than year old battery in to Schucks tomorrow. Its a 84 month battery and it should be a free replacement. We'll see if I have any trouble getting it replaced. I have a Schucks lifetime alternator and starter also. Thanks, Gary
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