Fuel and Temp Gauges Don't Work - JeepForum.com

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post #1 of 29 Old 07-15-2012, 08:54 PM Thread Starter
blk83cj7+4
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Fuel and Temp Gauges Don't Work

No back light for speedometer. No high-beam indicator light. Directional indicator lights DO work. Do oil pressure and battery gauges have backlights?

Where do I start troubleshooting?

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post #2 of 29 Old 07-15-2012, 08:58 PM
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One of our Moderators on the CJ forum is John Strenk. Do a search and you will find all the answers for your gauge issues. John is the man when it comes to fixing gauges problems.

Good Luck............

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post #3 of 29 Old 07-16-2012, 12:04 AM
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As most of what you refer to are lights I would check the fuses, then check at the light switch that you are feeding voltage to dash lamps.

When you look up behind the gauge cluster you can see the wires and bulbs. Are they getting voltage?

Best tool is a test lamp and long leads. Hook one end up to battery -ve and start pprobing for voltage.

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post #4 of 29 Old 07-16-2012, 12:26 AM
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When I had no lights I turned my dimmer switch up first...
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post #5 of 29 Old 07-16-2012, 02:12 AM
John Strenk
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What about the lights for the controls on the dash like heater and vent. Do they light up or all all dash lights dead?


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post #6 of 29 Old 07-16-2012, 06:51 AM
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I am having this same issue. I have installed mechanical temp, oil and volt guages.
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post #7 of 29 Old 07-16-2012, 08:54 PM Thread Starter
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Thanks everyone for the replies. I guess I must learn to use that voltage tester collecting dust over there. Where the heck is the dimmer switch? lol. This Jeep was missing a few things when I got it, like the fast idle assembly. So I have a new carb on order. The jeep supposedly sat for 6 years. There is no power in 4th or 5th gear, so I must avoid the interstates until I figure it out.
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post #8 of 29 Old 07-16-2012, 08:57 PM Thread Starter
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Oh, and yes, all dash lights are out except for the turn signals and hazards.
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post #9 of 29 Old 07-17-2012, 02:53 AM
John Strenk
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Dimmer switch is on the headlight switch. Turn it one way or the other to brighten or dim your lights.
If you turn it in one direction you will feel a click and that should be full brightness. If the lights don't work then,
Time to get the test light out. And start testing fuses.

What happens is corrosion builds up on the wiper of the dimmer potentiometer and looses contacts' The windings have been known to fall out and short blowing fuses.


Short above


Corrosion and Loose windings could lead to shorts.


Maybe someone can confirm what direction is full brightness.


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post #10 of 29 Old 07-17-2012, 06:00 AM Thread Starter
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Can the dimmer switch be restored?
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post #11 of 29 Old 07-17-2012, 06:26 AM
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I've never tried but probably some cleaning and some epoxy can but it back into shape.

Switches didn't use to cost to much.


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post #12 of 29 Old 07-18-2012, 04:01 AM Thread Starter
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Thanks John, is there a special tool to remove the switch from the dash? It looks that way from the cab side.
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post #13 of 29 Old 07-18-2012, 06:22 AM
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FIrst pull the knob and rod off. There is a button on the bottom that you press in and you can slide it out all the way.

Then use a needle nose pliers to remove the nut and bezel


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post #14 of 29 Old 07-18-2012, 07:43 AM
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Quote:
Originally Posted by John Strenk View Post
FIrst pull the knob and rod off. There is a button on the bottom that you press in and you can slide it out all the way.

Then use a needle nose pliers to remove the nut and bezel
just a quick make sure you disconnect the battery, when you press the button and remove the rod, the lights come on, and will stay on until you unplug the harness..... Ask me how I know this!

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post #15 of 29 Old 07-22-2012, 10:58 PM Thread Starter
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Thanks guys. They is no knob so I don't have to worry about that.
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