73 cj 5 gauge problem - JeepForum.com
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post #1 of 4 Old 06-02-2020, 08:41 PM Thread Starter
Medic8852
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73 cj 5 gauge problem

Hello everyone. Was wondering if anyone ever experienced this issue... once in a while both the fuel gauge and the temp gauge would peg, yes as in showing a full tank and over heating, at the same time, then they would go back to normal. I didnít think much about it at first, a gremlin somewhere, until yesterday they both pegged to the right and then they drifted back to left as if neither is getting a signal, or is grounded out. Neither gauge will work. Fuses are intact. Wires are going to each appropriate terminal on the back of the gauge as according to the tsm and fit snugly. Anyone have any thoughts before I pull the dash panel loose and start tracing wires?
Thanks in advance for any help.


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post #2 of 4 Old 06-02-2020, 09:16 PM
BagusJeep
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Before pulling I would check the power with a test light. You should have battery power coming in to the fuel gauge, on the right as you look at the face of the speedo. On the left you should see a flashing power, this is a regulated power supply that supplies, on average, around 6 or 7V. The power regulator is inside the fuel gauge and feeds the temperature gauge as well, if it has stopped working you will not see a flashing light. (The centre prong goes to the sensor).

The reason i say to check this is that you can get your hand up behind the cluster and find these, it makes diagnosis a lot easier. After that you only have to deal with grounds and sensors.

Look up John Strenk's guide to these gauges, great stuff.

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post #3 of 4 Old 06-03-2020, 05:25 AM
John Strenk
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Bagus has a good plan for testing the gauges but if I had to make a hunch, it has all the symptoms of a bad ground.

Try running a wire from the screw holding the speedometer and run it to the negative post of the battery.
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post #4 of 4 Old 06-14-2020, 02:41 PM Thread Starter
Medic8852
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Did the gauge test procedure and found one wire not making good connection. Got that problem fixed and on to the next!
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