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03-29-2020, 11:58 PM
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#1 |
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Registered User
Join Date: Mar 2013
Location: Riverside, CA
Posts: 56
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Brake & Temp warning lights turn on with headlights
I have a 69 C20. The temp and brake warning lights in my fuel gauge turn on and stay on when my headlights are on. When my headlights are off they remain off. Anyone know the cause/why this happens?
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03-30-2020, 09:36 AM
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#2 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,727
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Re: Brake & Temp warning lights turn on with headlights
Most likely a grounding issue in the headlight circuit. Repair grounds up front at lights and add a ground strap possibly to instrument cluster.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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03-30-2020, 09:46 AM
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#3 |
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The Older Generation
   
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,772
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Re: Brake & Temp warning lights turn on with headlights
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Here is a thread on ground strap locations with some tips on making them yourself and installing them. Yeah, I know it's 4 pages long but it is a good read and it will cure a lot of electrical problems..... http://67-72chevytrucks.com/vboard/s...d.php?t=422234 LockDoc
__________________
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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03-30-2020, 12:00 PM
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#4 |
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Registered User
Join Date: Mar 2013
Location: Riverside, CA
Posts: 56
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Re: Brake & Temp warning lights turn on with headlights
Thanks for the quick responses Mike and LockDoc! I'll check the grounds and let you know how it comes out.
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04-16-2020, 06:18 PM
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#5 |
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Registered User
Join Date: Mar 2013
Location: Riverside, CA
Posts: 56
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Re: Brake & Temp warning lights turn on with headlights
Well my grounds were all good but a bit old and dirty so I went the extra mile and replaced all with new ground cables and ensured bare metal contacts but it didn’t solve the problem. Any other ideas?
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04-16-2020, 06:21 PM
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#6 |
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Registered User
Join Date: Feb 2015
Location: friendship WI
Posts: 174
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Re: Brake & Temp warning lights turn on with headlights
check the dash ground
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04-16-2020, 06:24 PM
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#7 |
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Registered User
Join Date: Mar 2013
Location: Riverside, CA
Posts: 56
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Re: Brake & Temp warning lights turn on with headlights
That was my first thought. It’s good.
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04-16-2020, 06:38 PM
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#8 |
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Registered User
Join Date: Feb 2015
Location: friendship WI
Posts: 174
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Re: Brake & Temp warning lights turn on with headlights
printed circuit bad
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04-17-2020, 12:46 AM
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#9 |
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Registered User
Join Date: Mar 2013
Location: Riverside, CA
Posts: 56
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Re: Brake & Temp warning lights turn on with headlights
Ok thanks
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