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      01-03-2013, 01:10 PM   #20
Professional Trophy Husband

Drives: '09 M3 Sedan DCT
Join Date: Dec 2010
Location: Dallas, TX

iTrader: (0)

I've been having the exact same problem. When it started getting cold this winter, my car started giving me a low battery signal. Then the comfort access stopped working, and shortly after I couldn't start the engine. I took it to the dealership and they tested the battery. They said it was fine, that it just needed a charge, but that I must have a parasitic drain. They blamed my amp setup. I have a JBL MS-8 and a JL Audio amp. But both amps are triggered by the headunit only. My car is still under warranty and I've had the amps for almost two years with no problems. Is it possible the extra amps caused a slow parasitic drain or wore out my battery prematurely? If so, what can I do about it?