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#1 |
Registered User
Join Date: Nov 2019
Location: Eagle River Alaska
Posts: 320
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Lights turn off
When I pull put my headlight switch the gauge cluster lights turn off. When it is pushed in the cluster lights turn back on. It's almost like it's working in reverse. All wired have power to them. The bulbs for my blinkers stay on. They still flash when they sre engaged but the actual bulb stays on when they are not engage also. The red light for my high beams stays on at all times also even with the high beams turned off. I have the key in the on position but not started, would that make a difference? I also have not cut or messed with any of the wires. Some of the dash bulbs will turn off when I put the socket in even though they have power to the circuit board. Is there a certain order the bulbs need to be put in? I am going to get all new bulbs today, I think a couple are bad. I still dont understand why everything turns off when the lights are engage though.
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#2 |
Senior Member
![]() Join Date: Jun 2002
Location: Murray, Kentucky
Posts: 3,483
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Re: Lights turn off
Probably, and I do emphasis probably, a bad light switch. It's the weakest link.
Good luck, Rg
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Roger '68 Short step - https://67-72chevytrucks.com/vboard/...d.php?t=849675 '69 ('70?) 2wd Blazer '70 GMC Jimmy 2wd '73 Firebird - https://67-72chevytrucks.com/vboard/...d.php?t=853203 |
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#3 |
Registered User
Join Date: Nov 2019
Location: Eagle River Alaska
Posts: 320
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Re: Lights turn off
I just dont know, I bought a new light switch, I ended plugging the old one back in and its just doing the same thing. I bought a brand new circuit board and my test light shows all the circuits getting power. Maybe if I replace all the bulbs it will fix it. Thank u for the thoughts.
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#4 |
Senior Member
![]() Join Date: Jun 2002
Location: Murray, Kentucky
Posts: 3,483
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Re: Lights turn off
Your marker lights and headlights should come on even if the key is not turned on. All this is assuming a stock harness. If someone has rewired something all bets are off. Now the ignition switch does disable some circuits when the ignition is in the crank position but it shouldn't in the on position. I'd have to look at the wiring diagram to tell more. I'm thinking replacing bulbs is not going to help you.
Good luck, Rg
__________________
Roger '68 Short step - https://67-72chevytrucks.com/vboard/...d.php?t=849675 '69 ('70?) 2wd Blazer '70 GMC Jimmy 2wd '73 Firebird - https://67-72chevytrucks.com/vboard/...d.php?t=853203 |
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#5 | |
Registered User
Join Date: Nov 2019
Location: Eagle River Alaska
Posts: 320
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Re: Lights turn off
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#6 | |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,706
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Re: Lights turn off
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#7 |
Senior Member
![]() Join Date: Sep 2014
Location: Wenatchee, Wa
Posts: 910
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Re: Lights turn off
Headlight switches are less than $20.00....I would start there as suggested.
Okay, I see you bought one but did you install and test? Last edited by MySons68C20; 03-09-2020 at 02:55 PM. Reason: New info |
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#8 |
Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,662
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Re: Lights turn off
First, you have to ensure ALL of the grounds are connected properly or weird things can happen. After your grounds are figured out, you're gonna have to trace all the wires, the printed circuit, dimmer switch, and the turn signal switch to make sure connections are complete with no issues and wiring is good to go. Replace wires as/if needed. Double check the headlight switch to make sure the harness is connected properly (re-plug it in again). Gotta love electrical gremlins smh.
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72 C10 lwb fleetside -stock 350/350 combo |
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#9 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,506
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Re: Lights turn off
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Read through this thread. Yeah, I know it's 4 pages, but there is some important information in it.... http://67-72chevytrucks.com/vboard/s...d.php?t=422234 LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#10 |
Registered User
Join Date: Feb 2011
Location: Parkville, MD
Posts: 1,024
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Re: Lights turn off
To me, it sounds like a bad ground. The lights are grounding through the headlight switch when it is off. Once it turns on, the ground is no longer available.
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1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z |
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