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Old 10-13-2012, 11:56 AM   #4
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 10,405
My Ride: '06 330CiC, '03 M5
Depending on how and where you measure the battery, 12 Volts reading is only about 50% level of charge. A fully charged battery should read 12.6 Volts.

You need to leave your windows and hood open and after you turn off your car, come back after 25 minutes and listen to determine if you can hear any fan motor running. There are 2 fan motors that have issue, the small one in the climate control panel and the main HVAC blower motor.

Doubt your fuel pump is an issue if you have the battery going flat.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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