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Old 09-09-2007, 09:46 AM
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Trying to get headlights to work

I got a 1967 C-10 and the headlights aren't working, the tailights work and the front blinkers work, but the back blinkers do not. Off the plug going onto the right headlight is a light green wire, a tan wire and a black wire. I know the black is ground and i traced that and cleaned it up, the other two go along the ratiator support to the left head light and then to the junction box, and from the juntion box to the hi,lo beam button. so then does it go to a fuse in the fuse panel because i can't find power in the green or tan wire? I am guessing the headlights would be fused but none are labeled specifically headlights. I have schematics, but i am only 17 trying to do this stuff with little knowledge about it.
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Old 09-09-2007, 09:55 AM
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There's no headlight fuse in your truck. Most older vehicles always used a circuit breaker built into the headlight switch as a safety valve. Look at your floor mounted dimmer switch. It's 3 wires with one coming from the main switch and the other two going out to the lights. It's very common for dirt and moisture build-up to cause problems at it's connections, or the dimmer switch may just be bad. Either way, if you have power there, then you can jump to the other wires one at a time. If the lights work, clean, repair or replace connections as needed or the switch if it's bad.
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Old 09-09-2007, 10:03 AM
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Should be a yellow wire going to the middle position of the dimmer switch.

If you have power there, when the 'lights' are pulled out, then the dimmer is the problem.

The blue wire is low beam----the tan is high beam.

Do not try to fix this switch, they are cheap and can start a fire on the floor.
Ask me how I know this

If there is no power to the center (yellow) position of the dimmer with the lights on, look for a broken wire (red) going to the switch----I doubt this as you have taillights.

Get a new Headlight switch---these are pretty cheap too.
could be a bad circuit breaker inside the switch

Bryan
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Old 09-09-2007, 10:06 AM
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thanks for this info it helps a lot
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Old 09-09-2007, 10:22 AM
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And if the dimmer's 3 way connector is badly corroded or just rotted away, these should be available from a real parts store where the help actually understands what you're talking about. And yes, I should have mentioned that the center wire is the power coming down from the switch. Usually the headlight switch will not fail all at once but begin by shutting off intermittently. Reach up under the dash and the switch will be a little warm when in operation. If it's getting pretty hot, it's probably on it's way out. As Bryan said, neither these or dimmer switches are very expensive and in a vehicle of this age, replacing both is not a bad idea. To remove the headlight switch reach your hand up around it and feel for a small spring loaded release button. Pull the knob out to full on position, depress this button and pull on the knob again and the knob and shaft will come right out. Then simply remove the retaining bezel, pull the switch down and unhook the connector plug. Make sure the metal female spades in the connector are clean and fit the male spades on the switch snugly.
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Old 09-09-2007, 05:21 PM
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I feel dumb that i never really paid much attention to the dimmer switch until you said something, a grabed the three way plug on the back and pulled the whole back of the switch off and the swich fell off the base that is screwed to the floor, it was just all croded to heck. Anyway there is power doing to it so i think if i get a new swich they should work!!

Thanks for all your help
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