Results 1 to 4 of 4

Thread: 2003 325xi battery indicator light

  1. #1
    Join Date
    Nov 2009
    Location
    Baltimore, MD,
    Posts
    4
    My Cars
    '03 325xi

    2003 325xi battery indicator light

    I'd like to ask where do I begin w/the red battery indicator light just coming on and how to remedy the issue. Please help!

  2. #2
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,934
    My Cars
    2018 BMW M240i
    If the red battery light is coming on it generally means that your alternator isn't properly working and the battery is powering the electrical system. How many miles on the car? How old us the battery? Has the alternator ever been serviced (i.e., a new voltage regulator)?
    Last edited by MarcoZandrini; 04-27-2014 at 08:53 AM.

  3. #3
    Join Date
    Feb 2010
    Location
    Newburyport ma
    Posts
    2,108
    My Cars
    88,m5 95 740 04 XI E90
    Its a bad voltage regulator. Either get one or a rebuilt alt.

  4. #4
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,934
    My Cars
    2018 BMW M240i
    Quote Originally Posted by bmwbob89 View Post
    Its a bad voltage regulator. Either get one or a rebuilt alt.
    Try FCPGroton for a new regulator. BUT FIRST, you need to find out which alternator is in your car. There are three possibilities:
    - 80 amp Bosch
    - 120 amp Bosch
    - xxx amp Valeo

    If it's the Valeo you need to replace the alternator with a new/rebuilt alternator. If it's a Bosch, you can replace the voltage regulator. And no, you can't swap the Valeo for a Bosch or visa versa as the connectors are different.

    How to determine which alternator is in your car - read the label on the back of the alternator using a flashlight and a mirror.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •