Temp Gauge Issues

Discussion in 'Electrical and Ignition' started by mghikas, Jun 23, 2018.

  1. mghikas

    mghikas Well-Known Member

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    Hey Guys,
    I’ve got a 72 Demon with non rallye dash, temp gauge has never worked, all other gauges working including fuel.
    Have replaced sending unit and tests cable going to it and it is all good.
    So I narrowed it down to a faulty gauge, pulled the gauge and replaced it with a new one and it’s still not working, also now my fuel gauge is playing up which it wasn’t before. Do you guys think it’s an issue with the voltage regulator or the circuit board itself?
    Thanks in advance for your help
    Cheers from Oz
    Mike
     
  2. halifaxhops

    halifaxhops It's going to get stupid around here! FABO Gold Member

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    Shoot continuity from the sender wire to the gauge make sure it is good first. Then ground the wire at the sender and see if the gauge moves, if so it is the sender. That's where I would start. Just FYI
     
  3. demonmike70

    demonmike70 Well-Known Member

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    When I had problems with my 72 demon, non rally dash, it was the regulator on the dash. Mine read to hot. I would get a factory service manual. You could also have a wiring problem at the bulk head.
     
  4. 67Dart273

    67Dart273 Well-Known Member

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    If the IVR is the original type I'd get a solid state replacement. ALSO the contacts where the IVR plugs in can get corroded and you must solder across them to bridge to the PC board traces. Check the connector pins for loose, and repair. Last the nuts on the gauge nuts need to be loosened/ tightened to "scrub" them clean

    There's an old thread on this and it's a good one

    Printed circuit pins repair
     
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    • tony elia

      tony elia FABO Gold Member FABO Gold Member

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      i would pull the wire off sending unit and take voltage reading to ground. if voltage is present, it is sending unit and they differ in resistance if generic is used.you can also short that wire to ground quickly gauge should jump. if no voltage check at block in fire wall for bad connection same way as at sending unit. although because the gas gauge is also acting up sounds like voltage regulator. easy fix. had this same problem in a 64 were neither gauge worked, unfortunitly the regulator is built into the gas gauge, not easy fix.