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My 520i drains battery overnight - 525 BMW Cars & Trucks

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This is obviously a wiring problem, I would start testing all circuits with no key n the ignition to see which ones are drawing power. The first circuit I would check would be for the starter selonoid, as this would be the most practical place to start. then I would move onto he ignition. Good luck and remember to rate all the solutions you get.

Posted on Oct 30, 2008

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