Discussion in 'General Motoring' started by C. Bailey, Oct 4, 2003.

  1. C. Bailey

    C. Bailey Guest

    I replaced the speed pickup in my 91' Dynastry. Still having speedometer
    problems. Speedometer seems to work when lights or on high beams, or if I
    flash to pass. However, some days it will work. Other days, even the
    tricks with the lights don't help. Any thoughts or advice appreciated.

    C. Bailey, Oct 4, 2003
  2. C. Bailey

    frerichs Guest

    You are loosing either ground or power to the instrument cluster.
    When you flash the high beams you are supplying a small amount of
    additional power or ground through the blue high beam bulb. Sometimes
    this is enough to make the cluster operate. I do not have the wiring
    harness schematic for that model year car so I can not tell if it is
    the ground or the power but it is one or the other.
    Around this model year there was a problem internal to the cluster
    where a power resistor got too hot and fractured the solder on it's
    leads. If the resistors leads are resoldered it would again work for
    several years.
    frerichs, Oct 4, 2003
  3. C. Bailey

    C. Bailey Guest

    Thank you,

    This is more information than I've ever been able to find on this problem!

    Any idea where I would find the resistor you refer to or how I could further
    track it down. Have multimeter, and know how to use it. Have soldering
    iron as well. Have had instrument cluster out, and will take it out again.
    Just haven't got the foggiest where to look.

    My blue high beam bulb doesn't work - any chance it's related?

    C. Bailey, Oct 4, 2003
  4. C. Bailey

    C. Bailey Guest

    Is there any chance this TSB addresses my problem?


    The connection to the speed sensor seems good. Connectors are clean. I
    just installed a new speed sensor, and I had the same old problems
    immediately. I would have expected the terminals would need some time to
    corrode before I would see problems again.

    C. Bailey, Oct 4, 2003
  5. You *might* also consider soldering the contacts together or possibly creating
    shunts with small pieces of wire or omething if it is really bad.

    What happened in my case - I pulled the cluster and fixed it - and the first
    major bump I hit, it went loose again. Tommorrow I solder the thing down
    hard. If it breaks again, I have a desoldering tool or will get a new
    one with a tach in it from the junkyard.
    Joseph Oberlander, Oct 4, 2003
  6. C. Bailey

    Dave Guest

    If you purchased the sensor from a Cry. dealer it will com with a new
    pigtail connector.
    Dave, Oct 4, 2003
  7. C. Bailey

    C. Bailey Guest

    Thank you,

    Could you give me more specifics as to what you are soldering in the
    instrument cluster? I've had it apart, and didn't notice any obvious
    problems. However, if I know where to look, I might spot it.

    C. Bailey, Oct 4, 2003
  8. C. Bailey

    C. Bailey Guest

    I did purchase from a Chrysler dealer, but no new pigtail connector with
    it......$96 CND.

    C. Bailey, Oct 4, 2003
  9. The connectors - three of them - the backsides of the connectors.

    Also, you see where the board slides over the pins coming out of the
    gauges themselves? Those get loose too. *usually* crimping the
    contacts they slide into makes them tight enough. In my case, not.
    A drop of solder should be adequate.

    Also look for blown solder joints or components. A magnifying glass
    is pretty much required.
    Joseph Oberlander, Oct 4, 2003
  10. C. Bailey

    C. Bailey Guest

    Thank you,

    Will take a look.


    C. Bailey, Oct 5, 2003
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