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E34 (1989 - 1995)

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Old 08-25-2012, 09:46 AM
Lloyd Anderson Lloyd Anderson is offline
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Location: michigan
Join Date: Aug 2012
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Mein Auto: 1994 BMW525i
1994 BMW 525i battery drainage

I've been having problems with my battery draining. The only thing I have done is have the battery tested and I've checked the fuses.
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Old 08-26-2012, 06:24 PM
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goosefoot33 goosefoot33 is offline
Location: Hudson, MA
Join Date: Mar 2008
Posts: 1,855
Mein Auto: 01 330Ci/02 525iT
Have you verified your alternator is functioning? How did you test the battery- while in the car, or did you take it to an auto parts store to have them test it?

With the car running, you should have ~13.5 volts between the positive and negative terminals. With the car off, it should read around 12 volts. You can perform this test with a ~$20 multimeter. There is a way to test your alternator as well, although I am not exactly sure how to do it. One of the wires should read ~13.5 volts when the car is running. I know the alternator is hard to get to on the M60 engines, I have no experience with the M50 engines.
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Old 08-27-2012, 12:29 AM
paperplane94 paperplane94 is offline
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Mein Auto: 1989 525i M20B25
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