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Thread: 2000 540i e39 alternator issue

  1. #1
    Join Date
    Apr 2016
    Location
    miami
    Posts
    8
    My Cars
    '99 bmw 540it

    2000 540i e39 alternator issue

    While driving, my battery light lit. I knew it was an alternator issue. I pulled over, let it idle, and checked it with my meter. It was charging at 13.5v. When i got back to drive i noticed the light was off. As soon as i took off, the light came on and stayed on till i deccelerated or idled. I drove 40miles to get home randomly decellerating or idling at a red lights to maintain the battery. I just checked the battery and it shows over 18v of charge. Is this a voltage regulator issue (overcharging) ? Does this water cooled alternator have brushes i can change ? this alternator has me really confused.

  2. #2
    Join Date
    Jun 2002
    Location
    Aberdeen, NC (yes, again)
    Posts
    23,672
    My Cars
    E39M5, E500 4WD
    You need a new alternator, and the o-ring that seals it. Do NOT drive or even start the car !!! 18 volts can kill every computer in the car ! I repeat, do NOT start the car!

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

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