The 1947 - Present Chevrolet & GMC Truck Message Board Network

Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board


Thread Tools Display Modes
Old 05-18-2017, 03:50 AM   #1
Registered User
DroppedC20's Avatar
Join Date: May 2017
Location: Mankato MN
Posts: 2
Headlights not working!!!

Just picked up a 67 C20 and the wiring is honestly a cobbled mess. Can't get headlights to come on with either the bright or dim mode and I don't believe there's a headlight fuse on these trucks (?). Any common things on these that could cause the headlights to not work? I'm absolutely not an electrical magician so to chase down the problem on my own could take forever. There's no taillights on the truck right now, could that cause an issue? I do get front turn signals though if that matters.

At some point I plan to replace the wiring harness but at this point I just want to get the truck road worthy ect before I REALLY tear into it. Here's a couple photos of Chloe!
Attached Images
1967 C20
DroppedC20 is offline   Reply With Quote
Old 05-18-2017, 12:54 PM   #2
Registered User
custom10nut's Avatar
Join Date: Apr 2015
Location: Columbia SC (temp) East Tn (soon)
Posts: 1,010
Re: Headlights not working!!!

Clean all you contacts at the switch, and put dielectric grease on them. Also clean all your grounds.
custom10nut is offline   Reply With Quote
Old 05-18-2017, 01:10 PM   #3

leddzepp's Avatar
Join Date: May 2007
Location: Southern Cal
Posts: 17,769
Re: Headlights not working!!!

Dimmer switch is most likely the culprit. Replacements are inexpensive
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed.

1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck.

leddzepp is offline   Reply With Quote
Old 05-18-2017, 02:24 PM   #4
Active Member
smoked68's Avatar
Join Date: Oct 2006
Location: Rock Hill, SC
Posts: 418
Re: Headlights not working!!!

Dimmer switch as stated above. Had the same thing, replace and there you have it.
1968 chevy shortbed, Dark Shadow Gray
4 bolt 350,Weiand Super Charger, Engle cam, disc brakes, 4.11 gear, 20" Eagle wheels, muncie 4 speed/ Hurst shifter, 4/7 drop, Hedman midlengths, 3 inch exhaust w/ 2 chamber flows. 1966 Mustang with 306 roller, built c-4, 9 inch Detroit locker rear. 1965 Fastback Mustang w/347 stroker, top loader 4spd, 9 inch detroit locker. First gen Hayabusa, airbox mod and running 2 exhaust cams.. Zoom Zoom Zoom
smoked68 is offline   Reply With Quote
Old 05-18-2017, 03:59 PM   #5
Registered User
Join Date: Jan 2011
Location: Mullin, Texas
Posts: 4
Re: Headlights not working!!!

Replaced mine on Monday and cleaned the grounds, lights work now, the wires corrode over the years on the dimmer switch.
cookseyb is offline   Reply With Quote
Old 05-18-2017, 10:36 PM   #6
Registered User
Steeveedee's Avatar
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 1,115
Re: Headlights not working!!!

No fuse on the headlight circuit, it has a fusible link. I think that it is by the battery. You will see a wire of a different (smaller) diameter installed in the circuit to the switch. If you don't have a factory service manual, get one, or, IIRC, some really nice guy here has uploaded them for your reading pleasure.
'70 Chevy 3/4T Longhorn CST 400/400/3.54 Custom Camper

"Orange Acres"
Steeveedee is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -4. The time now is 12:57 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright 1997-2013