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#1225651 - Sat Jul 15 2017 06:06 PM Tail light issue  
Modelman  Offline
Shop Shark
Joined: Mar 2001
Posts: 4,361
Lacombe, LA. USA
I hope i explain this correctly and also hope other can direct me to the possible fix?

When I pull the headlight switch out to the first position the hood running light and tail lights come on. When I press the brake pedal the passenger side brightens but NOT the drivers side.

BUT when I pull the switch to out fully to turn on the head lights, the tail light out out?

Any pointers?
21 circuit from E-Z wiring is what is installed

Thanks


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#1225666 - Sat Jul 15 2017 07:53 PM Re: Tail light issue [Re: Modelman]  
rfs56trk  Offline
Shop Shark
Joined: Apr 2005
Posts: 1,698
Seal Beach, CA
Most light problems can be directly related to bad grounds. Grounds don't like rust and they especially don't like new paint and powder coating. I would clean all contact areas and use star washers and new hardware as a starting point.
Also the brake lights go through the turn signal switch so that may be a place to look.
Fred

Last edited by rfs56trk; Sat Jul 15 2017 07:56 PM.

#1225737 - Sun Jul 16 2017 11:15 AM Re: Tail light issue [Re: Modelman]  
Hambone  Online
Joined: May 2007
Posts: 1,076
california, md
Add a ground wire at the fixture. See if that helps. Did you add a ground wire from bed to frame?
Likely a very easy fix. My rusted 66 does this from time to time and I take a file to the light fixture, mounting bracket and to my extra grounding places. Fixes the problem until the corrosion takes over again.

Last edited by Hambone; Sun Jul 16 2017 11:17 AM.

HB

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#1225890 - Mon Jul 17 2017 12:41 PM Re: Tail light issue [Re: Modelman]  
Modelman  Offline
Shop Shark
Joined: Mar 2001
Posts: 4,361
Lacombe, LA. USA
New Wire Harness, but will add ground of bed to frame, added everywhere else, did not think to do that, I will also check and switch the bulbs to see of problem persist. On another forum, they suggested a bad filament even though it looks good.

"Check your rear bulb I've seen the filaments burn through and fall across to the other filament and back feed"

" --------------------------------------------------------------------------------

You would first want to switch rear bulbs and see if the problem follows the bulb. Also, on the one that won't light, stick a temporary ground from bulb socket to a good ground at rear while applying brakes. Report what happens.

Then: All I can say is re check the circuits once you know how it's supposed to be wired. The stop switch has a hot-all-the-time wire on one terminal and a wire that goes to the turn signal switch from the other terminal. Then two other wires come out of the turn signal switch. One for left brake/turn and one for right brake/turn. If you check at various connections/connectors/terminal blocks with a 12V ice pick tester light. that way you can see if 12V is present all the way back to tail light. (of course, be sure brake pedal is applied during all this). Take out the bulbs and touch the proper contact inside the socket with the probe and attach it's wire lead to a good ground back there. See if you can get both left and right to light the test light with brake applied. If that works, then it's the bulb or the socket is not grounding. If one does not light still, follow the wire for that bulb back until you find power. Report what happens.

I would like to know if the rear turn signals work?
You have a dual filament bulb back there. The rear running light "filaments" are wired to the headlight switch. The turn/brake filaments are wired to the turn signal. Don't get that mixed up. Follow the 1960 Diagram, the EZ wire instructions are generic. Don't let colors fool you, be sure the hook up is correct functionally.

Could be a simple ground problem or bad bulb.
Could be headlight sw not wired correctly, turn signal sw not wired correctly, or other wiring. The tests and wire checks above will start to tell.


1960 GMC 305A V-6 Gallery Page


Remember, the government cannot give --anything to anyone --that they have not first taken away from someone else.

BUY AMERICAN http://www.stillmadeinusa.com/index.html


Moderated by  Hambone, sixtyfive c-10 

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