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01-30-2006, 12:53 AM | #1 |
Registered User
Join Date: Jul 2005
Location: Oak Creek, WI
Posts: 29
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Head lamp Problems????
I have a 68 Gmc half ton long bed p/u. I pull my light switch and I have running lights, no sides markers work, but the frt and back running lamps work. The directionals works but no headlights work. I put in a new headlamp switch and the high/low switch. Fuses ok. What else could it be. I am a oldsmobile guy and new to this truck thing. Any help would be greatly appreciated. Thanks.
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01-30-2006, 02:46 AM | #2 |
Senior Member
Join Date: Jan 2005
Location: Raleigh, NC
Posts: 894
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Re: Head lamp Problems????
Does your '68 have side marker harnesses? That was optional back then. My '69 doesn't have the harness, so the markers don't work. It became standard in '70.
Check the ground for the headlamp circuit, use an DVOM and see if you have voltage getting to the bulbs or not.
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-Chris Building a stripper, one part at a time: 1969 K5, 307, 3spd, 3 seats, hard top. Added Pwr Discs, Pwr Steering, Aux Battery, T-case Skid, Lighted Sidemarkers, HEI, Lock-Right Diff, ECE Class IV Hitch, 32" MT/Rs. Parts to Install: Hand Throttle, Console, Tow Hooks, Dual Horns, AM-FM, Dealer Swing-Away Tire Carrier, Gas Tank Skid. Also building a 1950 Willys CJ-3A and off-roading a 2001 Nissan Frontier on 1-Ton Portals... |
01-30-2006, 03:03 AM | #3 |
Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,715
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Re: Head lamp Problems????
If you go to the electrical forum and click on the wiring diagram sticky and scroll down you'll find some colored wiring diagrams that may be some help.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
01-30-2006, 09:01 AM | #4 |
Registered User
Join Date: Jul 2005
Location: Oak Creek, WI
Posts: 29
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Re: Head lamp Problems????
Thanks, I'll check these out.
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01-30-2006, 09:09 AM | #5 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Re: Head lamp Problems????
Make sure you have a good ground on top of the passenger side core support. Take that bolt out and scuff up the metal on the core support and put the bolt back in.
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
01-30-2006, 11:10 AM | #6 |
Jamie Hyneman is my twin
Join Date: Nov 2005
Location: La Junta, Colorado
Posts: 705
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Re: Head lamp Problems????
The red wire that comes to the headlamp switch only powers the headlights, the orange wire powers everything else. If you don't have lights, check the red wire for power. Use your ohmmeter to check your new switch. With the nob pulled all the way out, you should have a circuit from the red connection to the blue connection (power out to the headlights).
Next check your dimmer switch to see if you have power to and power from. I had a bum dimmer switch, but it was from being burried under manure for 5+ years. You can click on the links on my signature for wiring diagrams, or send me a PM for a 300 DPI version.
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Justin SOLD 1967 K10 Fleetside, 283, Front and Rear Posi SOLD Color Wiring Diagrams Now in High Resolution V8 and Cab and Cab and Chassis |
02-02-2006, 11:18 PM | #7 |
Registered User
Join Date: Jul 2005
Location: Oak Creek, WI
Posts: 29
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Re: Head lamp Problems????
Thanks for the info.
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