Headlights, dash lights & front side markers not working - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71 C20 CS · 06-11-2021, 12:05 AM

All three just stopped working. After they stopped working I did a ground up rebuild on the front end and installed a new front wiring harness so I know it’s not up there, I also put in a new headlight switch, didn’t fix the problem either, checked the wiring plug to the switch and it has power.

Is this a ground problem? The parking and tail lights are part of the switch and they work. Any insight would be greatly appreciated.

body bolt · 06-11-2021, 11:53 AM

Quote:

Originally Posted by 71 C20 CS

All three just stopped working. After they stopped working I did a ground up rebuild on the front end and installed a new front wiring harness so I know it’s not up there, I also put in a new headlight switch, didn’t fix the problem either, checked the wiring plug to the switch and it has power.

Is this a ground problem? The parking and tail lights are part of the switch and they work. Any insight would be greatly appreciated.

Are you getting power to the switch? Through the switch? To the HL? If not, work backwards.

**BigBird05** · 06-11-2021, 07:51 PM

If the park and tail lights are working it isn't a ground problem.

71 C20 CS · 06-11-2021, 10:41 PM

Quote:

Originally Posted by BigBird05

If the park and tail lights are working it isn't a ground problem.

Yes, the parking and tail lights work. Do you think it could be the printed circuit board?

**davischevy** · 06-11-2021, 11:33 PM

It's your headlight dimmer switch.

**BigBird05** · 06-12-2021, 01:31 AM

If you have power to the head light switch ( big red wire ) then it is the head light switch that has gone bad.

71 C20 CS · 06-12-2021, 06:33 PM

Quote:

Originally Posted by davischevy

It's your headlight dimmer switch.

Well, that worked for the headlights, thank you! Front side markers and dash lights still not working......

**davischevy** · 06-12-2021, 11:08 PM

Side markers probably need ground. Do they have power to them?

71 C20 CS · 06-13-2021, 12:11 AM

Quote:

Originally Posted by davischevy

It's your headlight dimmer switch.

I stand corrected! I waited until it was darker and the dash lights are working and so is one one the side markers, I assume the other has a burned bulb. Thanks for your advice!

06-11-2021, 12:05 AM	#1
71 C20 CS Registered User Join Date: May 2021 Location: Seattle Posts: 13	Headlights, dash lights & front side markers not working All three just stopped working. After they stopped working I did a ground up rebuild on the front end and installed a new front wiring harness so I know it’s not up there, I also put in a new headlight switch, didn’t fix the problem either, checked the wiring plug to the switch and it has power. Is this a ground problem? The parking and tail lights are part of the switch and they work. Any insight would be greatly appreciated.

06-11-2021, 07:51 PM	#3
BigBird05 Senior Member Join Date: Aug 2019 Location: Cheraw Posts: 1,305	Re: Headlights, dash lights & front side markers not working If the park and tail lights are working it isn't a ground problem.

06-11-2021, 11:33 PM	#5
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,786	Re: Headlights, dash lights & front side markers not working It's your headlight dimmer switch. __________________ other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.

06-12-2021, 01:31 AM	#6
BigBird05 Senior Member Join Date: Aug 2019 Location: Cheraw Posts: 1,305	Re: Headlights, dash lights & front side markers not working If you have power to the head light switch ( big red wire ) then it is the head light switch that has gone bad.

06-12-2021, 11:08 PM	#8
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,786	Re: Headlights, dash lights & front side markers not working Side markers probably need ground. Do they have power to them? __________________ other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.



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