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Unread 07-27-2013, 10:38 AM   #1
CaddyRedCJ7
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Location: Rising Sun, IN
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Wiring on gauges

I have a 1977 CJ7 and my fuel and temp gauge didnt work. I found new gauges for 40 bucks shipped and replaced them. I put all the wires and the jumper bar back where it was when I took them off only to figure out that the jumper bar and the purple wire were both on the wrong post on the temp gauge and the jumper bar was on the same post as the red wire on the gas gauge. Today I put the wires and the jumper bar in the right locations but still no gauges, so could the gauges be fried due to the wires being switched around or should the new gauges be ok and I have a different issue with them not working?

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Unread 07-27-2013, 01:33 PM   #2
John Strenk
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i would check the resistances and see if anything burnt up.

See below...
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Unread 02-05-2014, 05:53 AM   #3
CaddyRedCJ7
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Ok so yesterday I tested the resistance on the gauges and everything seemed to be within range. I checked all fuses again (my fuse panel labels are hard to read so I don't really know which fuse is for what) so what is the next thing I should check?
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Unread 02-05-2014, 10:07 AM   #4
texasdave
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Are you testing them out of the dash panel to see if they work? The cluster has to be grounded by the mounting screws to the dash panel to complete the circuit.
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Unread 02-05-2014, 10:47 AM   #5
John Strenk
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As TexasDave ask, Are you checking this in the jeep or on a work bench?

If it's in the jeep Disconnect your ignition coil before you burn up the coil or the ICM.

Connect a good ground to the cluster housing.

Makes sure the cluster housing is grounded

Turn the ignition key to ON.

Makes sure the cluster housing is grounded

With the gauge properly grounded and power lead attached make sure you have power at the terminal:


Makes sure the cluster housing is grounded

Then Check that the "A" terminal, the one the strip is connected to, is flashing


Makes sure the cluster housing is grounded

Temporarily short the "S" terminals on each gauge to ground and see if the gas gauge moves to full or the temp gauge moves to Hot.

Makes sure the cluster housing is grounded

If this is good then you can move onto checking the ends of the sensor leads to see if current is reaching the sensors.

Makes sure the cluster housing is grounded

The Temp sensor is easiest.


The fuel tank is harder:


Makes sure the cluster housing is grounded
Makes sure the cluster housing is grounded
Makes sure the cluster housing is grounded
Makes sure the cluster housing is grounded
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Unread 02-06-2014, 01:03 PM   #6
CaddyRedCJ7
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I had them out of the dash but had the housing grounded to the bolt that grounds my fog lights.
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