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Thread: Speedometer not working

  1. #1
    Join Date
    Nov 2006
    Location
    Indiana
    Posts
    3

    Default Speedometer not working

    I have a 1984 325e that I have restored and almost complete. The Speedometer and odometer do not work. Where do I start looking to fix the problem? The tacometer works.

    Keith in Indiana

  2. #2
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
    Posts
    6,891

    Default

    usually the pick up in the diff is dead, it's not a ac pulse generator like most cars it's a magnetically triggered switch, you can test it with a multimeter set to diode where it beeps when current is allowed to flow, should pulse as the axles turn
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  3. #3
    Join Date
    Nov 2006
    Location
    Indiana
    Posts
    3

    Default

    If the sensor is dead, what kind of job is it replacing it. Does the differential need pulled and can I get the part at a catalog parts supplier?

  4. #4
    Join Date
    Jan 2004
    Location
    NC
    Posts
    755

    Default Easy to replace...10mm bolt I think.

    Quote Originally Posted by Keith W
    If the sensor is dead, what kind of job is it replacing it. Does the differential need pulled and can I get the part at a catalog parts supplier?
    You'll replace the sensor and its attached o-ring. No need to drain the diff, unless you're replacing the fluid. It's visible from the rear of the diff, and can be changed without jacking the car.
    Bill B.
    95 525i


  5. #5

    Default

    Quote Originally Posted by Keith W
    I have a 1984 325e that I have restored and almost complete. The Speedometer and odometer do not work. Where do I start looking to fix the problem? The tacometer works.

    Keith in Indiana
    The Speedos were made with a PC board on the back. The board through the course of years expands and contracts because of thermal expansion. If you examine the solder path on the PC board you will notice fine cracks that are basically causing open circuits. Go over, very carefully, these circuits with a soldering iron to reflow the solder. I had to do mine a few years ago. Also check the sensor in the Diff. cover. Most likely it is the speedo.

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