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cmonref cmonref is offline
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Join Date: Jan 2000
Location: Richmond, VA USA
Posts: 1,058
Are you using a good DVM for the testing?

Disconnect the negative battery terminal. Hook the DVM from the terminal to the disconnected terminal wire. If you see the ~.25A drain, remove each of the fuses, one at a time, and note the drain. When it is zero, THAT fuse's circuit has the short to ground that is causing the drain. Reinstall each fuse as you go. Do the engine fuse box also.

If you find a circuit with a drain, drag out your wiring diagram and start chasing connections in that circuit. Classical culprits include the door closer switch and the interior light switches.

If all circuits at the fuse boxes are OK, disconnect the battery ground. Remove the alternator. Disconnect the alternator's ground wire. Connect your DVM across the alternator ground wire to an engine ground. Reconnect the battery ground cable. Note if the DVM reads the drain amperage. If YES, then the alternator needs repair -- new diodes or identify and fix a short in the alternator's wiring.

Good luck. I found my drain in the alternator.

Brian
Old 11-27-2012, 03:53 PM
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