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#1 |
Registered User
Join Date: Feb 2010
Location: carthage missouri
Posts: 81
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Weird light question???
84 chevy stepside the brake lights work and blinkers all work until you turn the headlights on then the blinkers don't work and the brake lights don't work and finally the right driver light doesn't work anyone have any ideas why?
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#2 |
Registered User
Join Date: Mar 2011
Location: Vancouver, Canada
Posts: 107
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Re: Weird light question???
check the grounds, both under the dash and on the tail lights themselves.
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1984 3/4 Ton Reg cab Longbox 4x4, Carbed 350/Turbo 400 Trans/205 T-Case |
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#3 |
Arrived on a Pale Horse
Join Date: Mar 2007
Location: SnagTown Indiana
Posts: 2,524
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Re: Weird light question???
Buy a good ground strap kit, and ground the heck out of everything.
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Jason 87 V30 350TBI/400 White w/Boss V-plow 89 R3500 CC SRW |
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#4 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,194
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Re: Weird light question???
Ditto.
I used to paint the taillight brackets every spring and clean up the attaching bolts, using stainless nuts and washers (rather than the original star washers). I never could figure out why my lights didn't work - until I realized I was totally killing the ground circuit by doing so. I ran a separate ground from the bulb socket, down the taillight harness and directly to a clean spot on the frame; no more problems after that. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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#5 |
One shot, one kill.
Join Date: Dec 2007
Location: Saratoga Springs NY
Posts: 859
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Re: Weird light question???
As a general rule of thumb, garnered from years of expirence, the weirder an electrical problem is and the more systems it affects at the most weird times the more the issue will be a ground failure someplace. The reason is simple. B+ goes to one thing at a time in seperate circuts. Grounds are ganged to serve a group of loads. EG, at the tail lights there are 3 B+ circuts but only 1 ground. Thats the same at all 4 corners. IP clusters are the worst especially with guages and courtesy lighs are wired backwards from everything else with power going to the lamp first and ground supplied later. Jim
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1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot ![]() |
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