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Thread: Temp Sending Unit Test/Fix

  1. #11
    Thank you from BT ULTIMUS MAXIMUS STATUS tufcj's Avatar
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    Looks right, mine is a purple wire. The power for the temp gauge is regulated thru the fuel gauge, I think it gets 5 volts. You could check for voltage at the strap that comes from the fuel gauge. If you have an analog meter, you may see the power going on/off quickly. That's normal. If there's no voltage to the temp gauge, the bad news is that you have to replace the fuel gauge, or do what I did and just forget the factory gauge and get a mechanical one.

    Bob
    tufcj
    1969 AMX
    1967 Rambler Rogue

    If you need a tool and don't buy it...
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  2. #12
    Thank you from BT Grease Monkey
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    Post Instrument Cluster Wiring Schematic

    Name:  Instrument Cluster Wiring.jpg
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    The guage should have 19-21 ohms between terminals "A" and "S"

    According to the manual, the temp circuit is powered throught the fuel guage circuit.

    Your fuel guage work?

    There is a 3-amp fuse one up from the bottom right corner on the fuse panel that powers both the fuel and temp guage circuits.

    The fuel guage contains a voltage regulator circuit referred to as a CVR in the manual. If this is bad, neither guage will work.

    I would start by looking for power to the guage, then a bad ground, then check for open/shorts.

    Hope this helps. Can't wait till you get the bugs out and on the road!
    Its a Jeep Thing --- No one understands!

    "America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves."
    -Abraham Lincoln

  3. #13
    Thank you from BT Tech Master Bulltear Forum
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    Sep 2003
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    Thanks I'll try to print them.

    Very soon she will be on the road and I'll do a U-Tube video :)
    84' CJ8-360-Project M170 Jeep
    86' CJ7-258-Mommas Jeep
    Project CJ8 to M170 Conversion<----Click

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