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post #16 of 20 Old 07-21-2010, 11:04 AM
CJ5_Fan
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I had a similar problem on my CJ and found that first, the lights for the dash lights are typically a single orange wire harness connecting the bulbs and grounded via the dash. And secondly, the headlight switch has a very simple dimmer mechinism which is basically a contact touching a spring to create more or less brightness on the dash as the knob is rotated.

My contacts were dirty and the dimmer switch effectivly was not working. I verified that by jumping the orange circuit in the HL switch to a known hot lead (IIRC it was white) and that allowed all the lights to work but killed the ability to dim. I ran it jumped for a while with no problems.

I later replaced the HL switch and found the new HL switch dimmer circuit contacts needed to be cleaned prior to installation to get it to work correctly even though it was NOS.

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post #17 of 20 Old 07-21-2010, 11:40 AM
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Guess I will be messing with that this weekend
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post #18 of 20 Old 07-22-2010, 07:22 AM Thread Starter
dd4bama
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OK...there's a small black wire coming off the light switch that has a rubber end on it - I see it on the wiring schematic. Is that the ground? If so, where does it go? If not, what is it to?
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post #19 of 20 Old 07-22-2010, 07:50 AM
keith460
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Quote:
Originally Posted by dd4bama View Post
OK...there's a small black wire coming off the light switch that has a rubber end on it - I see it on the wiring schematic. Is that the ground? If so, where does it go? If not, what is it to?
Yes a ground wire and no also. You are referring to the black wire coming from the headlight switch wiring harness and it supplies the ground path to the factory OEM under dash courtesy lights. It is not actually grounded until the headlight switch is turned completely to the left until it "clicks". The courtesy lights are always powered or "Hot At All Times" but are not grounded so they do not light up all the time. When you turn the switch, then the path to ground is made and the courtesy lights turn on.

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post #20 of 20 Old 07-22-2010, 12:28 PM Thread Starter
dd4bama
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Originally Posted by keith460 View Post
Yes a ground wire and no also. You are referring to the black wire coming from the headlight switch wiring harness and it supplies the ground path to the factory OEM under dash courtesy lights. It is not actually grounded until the headlight switch is turned completely to the left until it "clicks". The courtesy lights are always powered or "Hot At All Times" but are not grounded so they do not light up all the time. When you turn the switch, then the path to ground is made and the courtesy lights turn on.
Roger that. Thanks. I am going to heed previous advice and clean all connections good and retry. If that doesn't work I'm assuming it's a grounding issue. I guess the next question is, does the light switch ground itself to the dash when it is installed? If so, how does one bench test it before putting it in?
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dash , dash lights , dimmer switch , gauges , ground wire , wiring , wiring diagram

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