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Hello,

I have an intermittent battery drain on a 325ci, mechanic could not figure out the cause. I'm tempted to disconnect the battery each time I leave the car until I can get it fixed. Can I just disconnect the negative terminal in the morning, then reconnect it at night? Or do I need to disconnect both? Any help is appreciated.

Thanks.
 

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It could be a worn out heater blower/fan final stage resistor. I think I read in the forum some place that other people were experiencing dead batteries due to heater blower/fan running when the car was off because of this resistor.
 
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