Question about 2001 BMW 3 Series

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All lights on my BMW 325i 2001 model go brighter then dimmer and so this goes on, includes dashboard lights all lights revs also seem to fluctuate .Steve Guess resistor or alternator ???????

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It's your alternator...sorry to say. Put a voltmeter on your battery and watch if voltmeter flucuates

Posted on Mar 25, 2011

  • Manolito64 Mar 26, 2011

    More specifically, it is most likely the brushes in your alternator. If you can find a vendor who will sell you brushes that fit, and you are handy with a soldering iron, you can fix it for about $10. Failing that, a new voltage regulator with new brushes in it costs $60 on line. The voltage regulator is held in to the back of your alternator by two screws, probably Torx screws.

    I usually try to find brushes that fit because I am cheap. Only once did I solder new brushes to my regulator, only to find that the regulator had been damaged by the worn out brushes arcing.

  • Manolito64 Mar 26, 2011

    P.S. If you have an automatic transmission, you should fix this right away. The transmission computer REALLY does not like fluctuating voltage.

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