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The power to brake lightlights goes through the signal switch, have some one watch while you hold brake pedal and wiggle signal lever to see if lights come on, if they do then its a bad signal switch, also check to make sure the hazard button is not on, try turning on the 4way flasher and then try brake
I had this same problem i cleaned contacts that the bulb goes in and put dialectic greese on them.Also one bulb I think on passenger side brake light.one element shorted.Replace bulb and you should be all set.Dont ask me why.Must be bad design.
So are the fuses getting power, they should be labeled. like tail or ctsy, or inst? The dash lights are usually 5 amps. You will need to get a wiring diagram to ck it out. but you may need to start by looking at the headlamp switch. I cant believe any GM dealer could not help you. Forget anyone from a auto parts store being any help. I can ck tomorrow when at work for a diagram.
Obviously you have a short somehow power is bleading over to this circuit. You may be forced to do some hard debuging (i.e wiring diagram, test light isolate the problem on the circuit).
If I were taking a guess I would try the following:
1) Remove the fuse for the taillight
2) If the light goes out I would start looking at the dashboard light switch
3) If the light does not go out then I would start looking toward the rear end of the truck wires that are scouffed, trailer light connections ect.
Hope this gives you a start, needless to say a short can take forever to find.
Check for missing brake light relay in central junction box behind battery. I had same problem with my 2004. Turned out the brake light relay had been taken out when car was take out of service.
WHAT YOU MIGHT CHECK IS THE FUSE FOR TAILLIGHTS, OR DASH LIGHTS. THEY WORK OFF THE SAME FUSE. IF THE FUSE IS BLOWN THE HEADLIGHTS WORK BUT NO TAIL OR DASH LIGHTS
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