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#1 |
Senior Member
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Location: BY THE CAROLINA SEA
Posts: 920
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No lights work
This 67 GMC 3500 of mine does not have a working light system. Even the cab interior light does not work. I am leaning toward a new lighting system wiring harness, but am wondering what I may be overlooking. I have checked the wires under the hood, and they seem ok. There are NO junction blocks, so perhaps a hidden fusible link?
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FRANKENTRUCK 1981 Chevrolet C10 Shortbed Stepside GRANDTRUCK 1968 Chevrolet C10 Stepside Longbed http://67-72chevytrucks.com/vboard/s...d.php?t=584617 PROJECT JIGSAW 1967 GMC C3500 GREAT WHITE 1986 Blazer M1009 454 engine w/700R4 transmission gas conversion |
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#2 | |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,518
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Re: No lights work
Quote:
Does it start and run? Do you have power to the headlight switch or the turn signal switch? The fusible link is the short wire between the + battery terminal and the junction block on the passenger inner fender. Do you have power at the junction block? LockDoc
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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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#3 |
Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,081
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Re: No lights work
There should be a smaller wire from the + batt terminal and then a fusible link to a junction block on the pass fender. That's what feeds everything but the starter motor. If it runs, then someone got creative with the wiring and it's time to get out the voltmeter.
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#4 |
Senior Member
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Location: BY THE CAROLINA SEA
Posts: 920
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Re: No lights work
The red wire in the firewall connector seems to be the problem. I GUTTED the lighting wire harness today, and it snapped loose from the firewall plug in my hand. This truck has no junction box either. It does not run at this time but it turns over and over. I'm about to put an HEI distributor in there and I believe that will get it running. I have decided to buy a new lighting harness from LMC. This one has several exposed wires throughout it and they do not look very good. I was not able to see how bad it was until I tore it out of there today.
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FRANKENTRUCK 1981 Chevrolet C10 Shortbed Stepside GRANDTRUCK 1968 Chevrolet C10 Stepside Longbed http://67-72chevytrucks.com/vboard/s...d.php?t=584617 PROJECT JIGSAW 1967 GMC C3500 GREAT WHITE 1986 Blazer M1009 454 engine w/700R4 transmission gas conversion |
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#5 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,518
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Re: No lights work
Quote:
That might be the best course of action at this point. Let us know how it goes.... LockDoc
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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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#6 | |
Registered User
Join Date: Mar 2016
Location: Goodwell, OK
Posts: 63
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Re: No lights work
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#7 | |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,250
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Re: No lights work
Quote:
Some notes on the red wire OP: Three wires attach to junction block secured with a 3/8" flange nut for a #10-24 stud. The three wires are described as: • 12 AWG red: This wire runs to the positive terminal on the battery. • 12 AWG red & fusible links configuration: A 12 AWG red wire runs from the firewall block to a splice. This wire is soldered with three additional 12 AWG red wires. One wire routes to the alternator, one wire to the voltage regulator, and one wire to a fusible link that attaches to the junction block. NOTE: The red wire from the firewall block also uses a fusible link near the splice. • 18 AWG black: This wire connects to #12 on the cluster connector and then down to the fuse box. It then runs from firewall block to the junction block. This wire has a 4 AMP in-line fuse near the junction block.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 09-19-2018 at 03:56 PM. Reason: Red wire |
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#8 |
Senior Member
![]() Join Date: Nov 2012
Location: BY THE CAROLINA SEA
Posts: 920
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Re: No lights work
Thanks for all the helpful information about wiring harnesses and where NOT to buy them. The 67 chevy front clip that I am buying has SOME type of wiring harness in it, but I'm not sure if it is the lighting/alternator harness, or the engine harness. I will find this out on pickup day.
What I would really like to do is convert this to HEI (with GMC Paul's harness), and install an internally regulated alternator. That should eliminate the need for that black box under the washer bottle I believe. I have to figure out which harness will be correct for this since this conversion strays away from 67 factory specs.
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FRANKENTRUCK 1981 Chevrolet C10 Shortbed Stepside GRANDTRUCK 1968 Chevrolet C10 Stepside Longbed http://67-72chevytrucks.com/vboard/s...d.php?t=584617 PROJECT JIGSAW 1967 GMC C3500 GREAT WHITE 1986 Blazer M1009 454 engine w/700R4 transmission gas conversion |
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#9 |
Senior Member
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Location: BY THE CAROLINA SEA
Posts: 920
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Re: No lights work
After dealing with this wiring issue, I am considering going with the HEI, matching wiring harness, and an internally regulated alternator. I wonder if I should hook up some junction blocks too...?
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FRANKENTRUCK 1981 Chevrolet C10 Shortbed Stepside GRANDTRUCK 1968 Chevrolet C10 Stepside Longbed http://67-72chevytrucks.com/vboard/s...d.php?t=584617 PROJECT JIGSAW 1967 GMC C3500 GREAT WHITE 1986 Blazer M1009 454 engine w/700R4 transmission gas conversion |
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#10 | |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,518
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Re: No lights work
Quote:
I can't advise on that. I think VetteVet added a junction block where the three red power wires connect up by where the voltage regulator was.... Read this thread. http://67-72chevytrucks.com/vboard/s...d.php?t=757426 It pretty much explains everything on that. LockDoc
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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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