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lights on the OBC keep blowing

Discussion in 'E34 (1989-1995)' started by Bullet967, Jan 14, 2012.

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    Hello all, I have a rather weird problem (at least to me). I am re-storing a 1991 E34 525i, and the lights on the OBC keep blowing about every 3 weeks or so. Is it the OBC, or what? Next I have a fuel gauge problem and do not know where to start fuel sending unit or Insturment panel. Please let me know where to start on both.
    Thank you.
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    Where are you getting the part number for the bulbs? BMW for years had an incorrect bub listed. I believe the correct one had a large rectangular black base and the incorrect one had a flat gray base with a hegagon cast into the bottom. The voltage was completely different between the two. The correct one is the same as used many places in the instrument cluster. Give us a part number or photo of the ones your blowing and I'm sure someone here can come up with the right one. Any parts-counter person on the job more than ten years should have an answer for you. Or I can check our bins.

    The correct one I believe is 12v and should look like this if I can attach photos to this new forum:

    The wrong one looks something like this:


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