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      01-12-2013, 11:43 PM   #2
cdmulders
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Drives: 2013 535xi
Join Date: Dec 2009
Location: Ottawa, Ontario

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I lived this exact scenario with my E39. It turned out to be an electrical drain on the battery caused by a malfunctioning electric fan. While this may not be the exact cause of your problem, I would suspect a short or unexpected drain on your battery. Troubleshooting may find the problem - check the draw on your battery and start eliminating circuits one by one until the circuit that is draining your battery is identified.

Good luck!
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2013 535xi, Carbon Black, beige interior, M Sport package, HUD, DDC & ARS
2010 Z4 35i, Crimson Red, beige interior, 6sp manual, Adapative Suspension
2000 528i, Cosmo Black, beige interior, Sport package (retired)