No power from fuse box to green wire on headlight switch - Team Camaro Tech
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post #1 of 10 (permalink) Old Jul 11th, 19, 04:36 PM Thread Starter
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No power from fuse box to green wire on headlight switch

No power from fuse box to green headlight switch wire. I jumped a positive 12v to grey instrument light wire and all lights worked except the turn signal and indicator lights...
When I attach the headlight switch to harness and pull out knob the headlights work but nothing else and dash light fuse blows. Must be a ground issue?
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post #2 of 10 (permalink) Old Jul 12th, 19, 02:32 PM
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Re: No power from fuse box to green wire on headlight switch

Could be grounds, or a dead short.


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post #3 of 10 (permalink) Old Jul 12th, 19, 04:27 PM
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Re: No power from fuse box to green wire on headlight switch

Dark green from fuse box should not have power on it until the park light switch is pulled out. It will have varying voltage, through the rheostat in the headlight switch which feeds the green wire power. The green wire supplies power to the inst fuse.
If the inst fuse blows when power is supplied to it, then you have a short circuit in the interior panel illumination circuit (grey wire) instrument cluster, heater control lighting.

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post #4 of 10 (permalink) Old Jul 13th, 19, 05:57 AM Thread Starter
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When testing the light sockets with working bulbs the heater control light socket is only one that won’t light up... maybe the issue is this area on the daisy chain?
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post #5 of 10 (permalink) Old Jul 13th, 19, 06:55 AM
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How are you testing lights? You said fuse would blow. I could be wrong but i think they are on same fuse as the brake lights so when you lose dash lights you know brake lights are out. I would think there is a wire when energized by turning on parking or headlights that is going to ground. I would isolate by disconnecting connections untill the fuse does not blow
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post #6 of 10 (permalink) Old Jul 13th, 19, 08:04 AM
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Re: No power from fuse box to green wire on headlight switch

chevyhp. the brake and instrument lights are not on the same fuse.

You have a short somewhere in the grey wire, bulbs, or sockets on the grey wire.

Remove the bulbs from the sockets. turn light switch off. use a test light that is connected to power. touch the test light probe on the illumination fuse. If the test light lights up, you have a short. Then start looking for it. when the light goes out the short is gone.

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post #7 of 10 (permalink) Old Jul 13th, 19, 05:37 PM
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Re: No power from fuse box to green wire on headlight switch

Quote:
Originally Posted by Chevyhp View Post
I could be wrong but i think they are on same fuse as the brake lights so when you lose dash lights you know brake lights are out.
Quote:
Originally Posted by dale68z View Post
chevyhp. the brake and instrument lights are not on the same fuse.
Chevy hp is almost correct. Stop, turn and tail are commonly on the same fuse and that fuse feeds the dash light rheostat power. So if the Tail light fuse blows, no dash lights.

The OP has said he's blowing a 10 amp fuse. I don't recall if they make on of those short fuses in a 10 amp if he has an original fuse box. No one has suggested he turn the rheostat off and pull the lights on and see if the fuse blows. If that car has an after market radio I'm looking at that first, if a console that connector is next if the short is on a gray wire.

Just my .02
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post #8 of 10 (permalink) Old Jul 14th, 19, 01:48 PM
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Good call on the consol wiring Jeff. Was just at a car show speaking with a guy with same trouble. His short to ground was at the rear consol light under the ash tray.
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post #9 of 10 (permalink) Old Jul 14th, 19, 07:18 PM
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Re: No power from fuse box to green wire on headlight switch

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Originally Posted by Chevyhp View Post
Good call on the consol wiring Jeff. Was just at a car show speaking with a guy with same trouble. His short to ground was at the rear consol light under the ash tray.
Different problem for him, he was blowing dome light fuse. I had the gray wire com out of the connector where it goes thru the metal bracket and short out on the bracket bowing the dash light fuse. I've seen so many aftermarket radio grounds connected to the gray wire on GM's I think it used to tell that in the instructions.

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post #10 of 10 (permalink) Old Jul 16th, 19, 08:07 PM Thread Starter
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Thanks for all the help. I removed the wires and found a ground wire was disconnected from my new fuel gauge to tachometer swap in new dash in the instrument pink grey and black wire harness
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