help posable short

Electrical and Ignition

  1. Tawny Demon

    Tawny Demon Well-Known Member

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    I turn the key on and the temp gauge ( car is cold) past 250 and the gas gauge is at past full when I only have five gallons in it and then there is the burning smell where would I start?
     
  2. Rocky_JS

    Rocky_JS 'cuda

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    what car it is would go a long way... I do assume by the problem it has a rallye dash as this is common failing to it and by the other post yesterday stating you had three posts on the back of the fuel gauge. The rallye dash fuel gauge has the voltage limiter built inside of it. When the limiter goes bad it sends battery voltage to all gauges save the amp gauge. All the gauges peg and quickly burn up the insulation on the nichrome wire (that is what you're smelling). You will need to replace the gauges or have them rebuilt and eliminate the internal voltage limiter for an external. Try contacting redfish PM on here and he should be able to help you with repairing your guage(s). http://www.demonivr.com/Chrysler Rallye Gauges.html

    I would disconnect the round plug in the back of the dash to try and preserve what maybe left of the guages. There is a bi-metal strip that the nichrome wire is wrapped around so killing the over volt issue now may preserve the bi-metal from being destroyed rendering the gauges un-rebuildable.
     
  3. Tawny Demon

    Tawny Demon Well-Known Member

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    1971 dodge demon non rally dash
     
  4. Rocky_JS

    Rocky_JS 'cuda

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    then you maybe lucky, the voltage limiter is separate from the gauge. I would still disconnect to avoid further damage to the gauges and replace the limiter. It is a plug in style and can be had at nearly any part store.
    borg warner part number R307.
     
  5. Tawny Demon

    Tawny Demon Well-Known Member

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    that is really that simple
     
  6. Rocky_JS

    Rocky_JS 'cuda

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    if the gauges didn't cook too long. Yes, it could be just that simple.
     
  7. Tawny Demon

    Tawny Demon Well-Known Member

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    like 2 seconds so both the fuel and temp are on that thing
     
  8. Rocky_JS

    Rocky_JS 'cuda

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    only one way to find out for sure and it would need to be replaced anyhow so you may as well just replace it and see. It is possible it lost its ground and went open, but I wouldn't gamble on that with a sold car. just replace it and confirm a good ground before re-installing the cluster if you need to pull the cluster at all.
     
  9. Tawny Demon

    Tawny Demon Well-Known Member

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    what pin and what color is the ground wire on the car and arnt the fuel and the temp senders a resistor or potentiometers or something like that so don't they act as the ground
     
  10. Rocky_JS

    Rocky_JS 'cuda

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    the limiter has a ground terminal on it and the cluster grounds to the dash frame. While I think the ground issue is further fetched from it having a bad limiter. But the PCB and limiter could have corrosion on it keeping it from getting a proper ground.

    roughly - the limiter sends 5.5 volts to the gauges. the gauge has an insulated nichrome wire wrapped around a bimetal strip. The nichrome wire heats up depending on the resistance from the sending units. The bi-metal bends from this resistance generated heat and moves the needle which is connected to the bi-metal. all senders do need a ground to function, but with all gauges inop it is not likely that problem.
     
  11. RedFish

    RedFish Well-Known Member

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    You might replace that limiter from underneath. I don't even try.
    If you try.. You need to be aware of the noise suppression capacitor. It has a short black lead on it with a male spade terminal.
    It is in the same female slot with the 12 volt spade terminal of the limiter.
    Some will state "You don't need it, just toss it"
    To leave it out can cause loose / intermittent connection to the limiter. To put it in the wrong slot can cause various problems including breaking the circuit board.
    Hope this helps
     
  12. green1

    green1 Well-Known Member

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    I think they make a solid state replacement.
     
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