Headlight Switch Mystery - Team Camaro Tech
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post #1 of 5 (permalink) Old Dec 6th, 09, 11:37 AM Thread Starter
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Mike
 
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Headlight Switch Mystery

I was wondering if anyone else had ever had this issue. When I try to ajust the rheostat for the brightness of my dashboard lights something weird happens. Even while the headlights are in the off position, the dash lights are on. Only in the extreme dim position of the rheostat do they go off. It works the same weather the light switch is in the off, park, or on position. If I accidently leave the rheostat in any other position the battery will drain. All of the other switch functions seem to work properly. I have tried a new GM light switch with the same result. My car is not an RS. Does anyone have any thoughts?


1969 Chevelle SS 396 325HP, Garnet Red, Red int, white top, original driveline
1957 Corvette 283 270HP Dual Quad, Red on red with white coves
2013 Corvette 427 LS7 Roadster, Red with black interior
1970 Monte Carlo SS 454 Triple Black, original driveline
2005 Mercedes SL55 AMG Roadster, Silver with grey interior
1972 Corvette two top roadster LS5 454, M20 4-speed. Original driveline.
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post #2 of 5 (permalink) Old Dec 6th, 09, 12:01 PM
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Fred
 
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Re: Headlight Switch Mystery

I'd be tracing the switches' wires looking for a splice that someone 'shade-tree'd.

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post #3 of 5 (permalink) Old Dec 6th, 09, 12:17 PM
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Kevin
 
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Re: Headlight Switch Mystery

You have a ground issue. Some circuit is powered, but with a weak ground and the dash lights are a common wire in series, so the rest of the circuit finds the ground path through the dash light wire back to ground. Happened to me on my taillight harness. Start unpluging things (not the light switch) and monitor the current flow on the POS terminal when everything thing is off. Once you see the current go to 0 amps, then the last thing you unplugged it the culprit. Luck!

Kevin


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post #4 of 5 (permalink) Old Dec 6th, 09, 03:33 PM
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Re: Headlight Switch Mystery

I agree with Kevin. Bad grounds can cause all sorts of funky behaviors like this. Try measuring the voltage between the battery (-) and the dash board metal when the circuit is misbehaving. It should be showing 0 volts (or very close - like 0.05V). If you see more than that, you definately have a bad ground. You may have to try a few different ground points to find the cause. The ground wire from the battery (-) to the right front fender would be a good place to check first.

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post #5 of 5 (permalink) Old Dec 6th, 09, 05:19 PM Thread Starter
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Mike
 
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Re: Headlight Switch Mystery

Thanks for the advice, I will give that a try!

1969 Chevelle SS 396 325HP, Garnet Red, Red int, white top, original driveline
1957 Corvette 283 270HP Dual Quad, Red on red with white coves
2013 Corvette 427 LS7 Roadster, Red with black interior
1970 Monte Carlo SS 454 Triple Black, original driveline
2005 Mercedes SL55 AMG Roadster, Silver with grey interior
1972 Corvette two top roadster LS5 454, M20 4-speed. Original driveline.
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