Question about 2001 BMW 5 Series

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2001 bmw 525 wagon dead battery issues

We have a new battery and a new alternator.  The car runs very well, but once a week or more the car is totally dead, no dash lights just nothing.  We do not activate the alarm with anticipation of this problem...We have taken to the mechanic and he claims that all is well. What to do?

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  • Anonymous Dec 29, 2008

    Mine is a 2002 525 series , it happens every now and then, the mechanic said he could not any issues with the battery or alternator.
    What could be reason? please
    regards

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Check out the the final stage resistor, know weak point that when it fails it leaves the little fan (which I think draws sample air into the themomostat for the ac system) this will drain the battery.

Posted on Mar 04, 2009

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I have a 2000 528 i and my battery kept going dead.. My factory amplifier for my radio went bad and that was draining my battery... If you charge the battery, then let it sit for a hour or two,(obviously with the car off) then feel the amp and see if it is warm.. That is how i found my problem.. Hope this helps... good luck.

Posted on Dec 28, 2008

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