Question about 1990 Chevrolet C1500
Replaced head light switch took tail lights off checked all bulbs all ok applied 12 volts to them all came on .
No parking lights @ rear tails, yes ! do you have a wire diagram, get one, there in the back of the haynes repair manuel. could be a bad connection @ rear, a wire may be shorted, corroded, after all, these wires are subject to road salt, debris, etc., inspect them closely, turn your parking lights on, pull on the wire harness, wiggle it, see if lights come on. have a helper watch for you when you do this. do your brake lights work? make sure your tails are in good shape, these light components corrode inside, so inspect them closely, then, follow the wire harness from rear to front along frame rail, to check condition of wires, all of them, if in good condition, check under dash, where you replaced switch, check fuses, use your wire diagram to locate and under stand the color of wires that come from the rear, and there function, remember, we are dealing with the tails, what powers them, and which ones do what. ignor all other wires, keep it simple dude. have a trouble light with you, It looks like an ice pick, with a wire lead on it and a aligator clip on it to attach to a good ground. electrical problems have a bad ground, remember that. by now you should know your wires for the tails, usually there green. with your taillights on, and your trouble light hooked up, check each wire to see if the troublelight goes on, this wire is good, if troublelight does not light up, wire has no continuity, therefore its bad. patience is a virtue, remember that. test wires on a circuit you know works, so you can feel more positive about what your doing, these problems can be easy, they can be @#$!%& , remeber, your trying to power up your tails, keep it simple, one wire @ a time. good luck,
Posted on Jan 13, 2013
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Posted on Jan 02, 2017
When my blazer did this they had to replace part of the wiring harness in the steering wheel. It took forever for them to get the parts because we live in nowhereville, but once it was in it works again and no problems. I had to take it to the actual chevy dealer because none of the other places had a clue. good luck.
Posted on Jul 31, 2008
check the wiring from the tailights back to the fuse panel, it sounds like an open connection. if i recall correctly check under the dash on the drivers side near the fuse panel for a bunch of wires in a bundle and look carefully for a wire or two that are cut/shorted/or seperated, you can also check under the drivers side kick panel by the hood release.
Posted on Feb 17, 2009
did you check for power with a test light,
there are some fuseable,links mounted on the fire wall on the passenger side under the hood,but it sounds like the headlight switch needs replaced
Posted on Feb 07, 2010
I've worked on these the first drove me crazy. its the turn signal switch every thing runs thru these. head lights, turn signal, brakes. except the third brake light. it runs directly from the brake switch. go figuare
Posted on Jun 22, 2010
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