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1997 BMW Z3 Lights fluctuating

Tiny
ABLUR2U
  • MEMBER
  • 1997 BMW Z3
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 38,000 MILES
I noticed that my lights fluctuate. Headlights, console lights, etc. Even with the headlights off my instrument panel lights dim and brighten. It is not a constant fluctuating. Maybe every 20 seconds or so. Car seems to run fine other than that. Can you tell me what the problem may be?
Thank you,
Dennis
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Wednesday, April 16th, 2008 AT 9:35 AM

2 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
I would definitely want to inspect the alternator output for any anomalies such as too much A/C voltage in the output or poor waveform from a failed or failing diode in the . Prepare to insect the grounds and the various connections between the battery and the alternator. It may require replacement of the alternator.
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Wednesday, April 16th, 2008 AT 11:33 PM
Tiny
ABLUR2U
  • MEMBER
  • 2 POSTS
Thank you very much for your response. I'm not good at the electrical part of car engine but you gave me some information that I can use and try to troubleshoot the problem myself before taking the car to the repair shop.
Thanks again,
Dennis
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Thursday, April 17th, 2008 AT 6:19 AM

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