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#1 |
Registered User
Join Date: May 2011
Location: Los Angeles, CA
Posts: 41
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Tail Light Issue
I recently bought a set of tail lights from Classicparts.com and my wiring is off and I dont know where to start. I searched the Electrical section of the forum but most, if not all threads are of post 67 trucks so I figured someone here might be more familiar with the problem.
http://www.classicparts.com/1960-66-...ctinfo/49-132/ Turns signal function is the only one that works. When I pull the headlight switch, nothing, and when I brake, nothing. The new tail lights have an orange and black wire, and my truck has a four wires going back, all the same color. I used a spark tester to tell the Left and Right signal wires, but got nothing from the other two. Other than follow the faulty wires up to the cab, what else could it be?
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1966 Step C10 |
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#2 |
Registered User
Join Date: Feb 2008
Location: Sidney,b.c.
Posts: 4,425
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Re: Tail Light Issue
how about your grounds
ron |
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#3 |
Registered User
Join Date: May 2010
Location: Roseburg, OR
Posts: 31
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Re: Tail Light Issue
I just went through the hell of taillight wiring and it was the ground in my case. Thats why the ground wire is always black- its EVIL!! Its ALWAYS the ground!! hahaha
If you look at where the taillight wiring goes through the firewall you can unplug it from the main harness under the dash. Thats where I started, tested the functions at the main harness. Just work you way back testing each part of the harness till you find the problem........which will probly be the ground hahaha. I couldn't even get my test light to ground on that old rusty frame of mine, had to resort to a flap disc to clean it up. -John
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#4 |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: Tail Light Issue
might sound dumb but I had ordered LED tails for my truck, and when I got them I wired them color to color as I expected. I turned everything on to find out the functions didn't work. I went back and noticed that each wire is labeled, and they do not follow "common sense" wiring. Black isn't ground, and they had 2 of the same color for signal and on.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING ![]() |
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#5 | |
Registered User
Join Date: May 2011
Location: Los Angeles, CA
Posts: 41
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Re: Tail Light Issue
Quote:
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1966 Step C10 |
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#6 | |
Registered User
Join Date: Dec 2008
Location: Yay Area CA
Posts: 2,329
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Re: Tail Light Issue
![]() Red=Stop/Turn Black=Taillight If there is no other wire for ground then it is grounded through the mounting screws. Make sure the bed is grounded to the frame and ultimately the frame needs to be grounded to the battery
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1965 GMC shortwide big window 1969 Chevy C20 long (for now) 2005 Silverado 2500HD Crew Cab Quote:
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#7 |
Registered User
Join Date: Jul 2011
Location: Vancouver, WA
Posts: 5
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Re: Tail Light Issue
I had a similar issue on my fleetside taillights. It seems that with any amount of rust on the frame, your grounds won't work since the mounting screws for the light fixture are the grounds.
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#8 |
Registered User
Join Date: May 2011
Location: Los Angeles, CA
Posts: 41
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Re: Tail Light Issue
I got sidetracked with getting this crap bumper off, but will definitely be giving the lights a go again. I'll keep you all posted. PO didnt even attempt to build brackets for it, and it dented my fenders about an inch in on both sides...
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