2001 BMW 530i Q&A
2001 BMW 530i Question: Battery Problem
Start with any thing not BMW does the car have an aftermarket stereo, amplifier, or burglar alarm check for power drain there first. Disconnect the battery and put an amp meter in line with the power cable look for the battery draw, it shouldn't be more than .2 Amps. Start pulling the fuses out one at a time and see pulling which fuse causes the battery draw to go away. When you locate which fuse makes the draw goes away then its down to checking the things protected by that fuse. Have you charged and tested the battery just to make sure you haven't got a bad battery. - patrick mannion
Yes, it was a bad altenator. JCM - Visitor
There is a control/relay/resister unit related to the cabin air circulation or AC fan Blower system. When it goes bad, it will suck down your battery in no time at all while the engine is off and the key is removed. It is located on the right hand front passenger "feet" area on the left side (shin high). Remove the thin strip of carpeted trim. You will find a plastic air box unit just above the carpet line. It is mounted to the drive train tunnel. That is the best way to describe the location. The unit has a bunch of aluminum studs protruding from it and these studs dissipate heat while the air is passing by it (when installed). You have probably noticed problems with your automatic low and high fan blower speeds and this is an indication of the problem. A good parts guy can read this and sell you the right part. It was not hard to change. 40 minutes. Brian Mac - Brian Mac
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My battery keeps going dead I installed a reman alt and battery stayed up for about 3 weeks the car is not a daily driver