I can only use the headlights on the parking position. If I turn them
to on, they don't come on. We tried changing out the switch but that
didn't seem to be the problem. I don't have use of my brights in any
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Could be the headlight switch. The switch has two sets of contacts for the parking lights, the park position and headlight position. You may need to check the circuit at the switch to see if you are loosing power when the switch is moved from park to head.
I'd be willing to bet your dash lights don't work either when you turn the headlight on.change the headlight switch, it has a short, it's only about 11 dollars at advance auto, and is fairly easy to replace. my 93 chevy did same thing, changed headlight switch, problem solved
The parking lights would not normally come on unless you turn them on with the headlight switch. The daytime running lights would come on in drive and go off in park. If you can't turn the parking lights on with the headlight switch, you would check the fuse, the relay if equipped, and the headlight switch.
1.Park the vehicle on a smooth, level surface and set the parking brake. Tilt the steering column to its lowest position. 2
Place your right foot on the brake. Put the key in the ignition and turn it to the "On" position, but do not start the truck. Shift the gear shifter to its lowest position.
Grab the dashboard bezel that goes around the radio and the gauge cluster with your hands, and pull it toward you to release the clips that hold it in place. Then unplug the wiring to the headlight switch and any other accessories on the panel (which change depending on what model of Sierra you own), using your hands. Pull the bezel away from the dashboard, and put the Sierra's transmission back in "Park."
4Place the dashboard bezel face down on a work surface. There are two tabs on either side of the dashboard bezel holding the headlight switch in place. Use the flat-head screwdriver to gently pry these apart one at a time, then pull the switch out of the bezel. Be careful, because depending on how brittle your dashboard is, you can break these tabs fairly easily.
5Push the replacement switch into the dashboard bezel. Then put your foot on the brake again, shift the truck into the lowest gear, and reinstall the wiring to the bezel using your hands. Push the bezel onto the dashboard to secure the clips, then put the truck back in Park and turn off the ignition
I had this very same problem on a GM truck at work the other day, I believe it to be a bad headlight switch because I cycled the switch between headlight and parking light positions, I had tails when I had the switch in the parking light position and not in the headlight position, changed the switch and everything worked, Made my day!
Sounds like a bum relay in the main underhood fuse box. My complete illustrated tutorial for repairing this $80.00 part is here: http://www.customsaab.com/Custom_Saab_NG900_OG9-3_Performance_Articles/p2_articleid/24