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Username Post: Perplexing, yet entertaining brake light issue - '79 C-20        (Topic#348107)
fedupwithchevy 
Forum Newbie
Posts: 52

Reg: 12-21-14
11-07-17 06:43 PM - Post#2713615    

There's a reason I named my '79 C-20 "The Antichrist" (a hats off to the movie "The Gods Must Be Crazy").

When the headlights and running lights are off, I have both brake lights and turn signals in the back.

If I turn on the headlights, I have turn signal on the left, but not on the right, and the brake light element of the bulb is constantly on on the right side. The brake light element of the bulb is working OK on the left side. Essentially, the brake light is constantly on on the right side (passenger side) and no turn signal on the right, but only when the headlights are on.

The only thing I can think of is a bad brake light switch,but if it was bad, would it not affect both sides whether the headlights are on or off?

There is also the possibility that the dimmer switch is verschimmelt. But given that, why would the brake/turn lights only be screwed up on one side and only when the headlights are on?

Is there a logical cause for this problem and if not, should I call in a priest to perform an exorcism?







 
2plus2 
Member
Posts: 1156

Loc: Mission,BC
Reg: 02-03-05
11-07-17 06:46 PM - Post#2713616    
    In response to fedupwithchevy

Bad ground for the 1 side will do that
It works when the lights are off because the filament grounds out through the rest of the running light filaments

69 Canadian Pontiac 2+2
factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35 bfg m/t's 9k winch cutout flares
07 Town Car Loaded,Tinted,Getting Bagged


 
Keith Seymore 
Contributor
Posts: 679
Keith Seymore
Loc: Southeast Michigan
Reg: 09-17-08
11-08-17 08:20 AM - Post#2713652    
    In response to 2plus2

x2 on "bad grounds".

When I would ask the electrical engineers for help they would always answer "It's a bad ground" before I could even explain the scenario to them.

Bad grounds will certainly make things appear demon possessed.

K


Chevelle Intro: http://www.popularhotrodding.com/features/1005phr_...
My Pontiacs: http://forums.maxperformanceinc.com/forums/showthr...
Pickup: http://67-72chevytrucks.com/vboard/showthread.php?...


Edited by Keith Seymore on 11-08-17 08:20 AM. Reason for edit: No reason given.

 
fedupwithchevy 
Forum Newbie
Posts: 52

Reg: 12-21-14
11-08-17 11:43 AM - Post#2713660    
    In response to Keith Seymore

Where would the ground connection be for this side of the circuit? Would it be safe to assume that it is near the actual tail light assembly (which would be the cheapest way for them to do it)?





 
raycow 
Honored Member
Posts: 27768
raycow
Loc: San Francisco, CA
Reg: 11-26-02
11-08-17 01:09 PM - Post#2713668    
    In response to fedupwithchevy

  • fedupwithchevy Said:
......Would it be safe to assume that it is near the actual tail light assembly (which would be the cheapest way for them to do it)?


No, it wouldn't be safe. GM found an even cheaper way. The light's only ground connection is through its mounting. That's the reason you are having problems now.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Keith Seymore 
Contributor
Posts: 679
Keith Seymore
Loc: Southeast Michigan
Reg: 09-17-08
11-09-17 09:12 AM - Post#2713771    
    In response to raycow

  • raycow Said:
  • fedupwithchevy Said:
......Would it be safe to assume that it is near the actual tail light assembly (which would be the cheapest way for them to do it)?


No, it wouldn't be safe. GM found an even cheaper way. The light's only ground connection is through its mounting. That's the reason you are having problems now.

Ray



On my 80 stepside I added a specific ground to each lamp, by attaching a wire to the light bulb base and running it down through the harness to the frame rail. That solved all my problems.

K



Chevelle Intro: http://www.popularhotrodding.com/features/1005phr_...
My Pontiacs: http://forums.maxperformanceinc.com/forums/showthr...
Pickup: http://67-72chevytrucks.com/vboard/showthread.php?...


Edited by Keith Seymore on 11-09-17 09:12 AM. Reason for edit: No reason given.

 
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