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quadracer_pimp 10-04-2007, 09:24 PM my third brake light works when pedal is pressed, but the LF and the RT taillight do not light up... turn signals, back up lights, running lights work fine....I replaced the bulbs, and the switch on the pedal....i'm stuck...any ideas???? heymccall 10-04-2007, 10:12 PM What year and brand (Chev or GMC) truck? Up to '98 have taillamp board problems. quadracer_pimp 10-04-2007, 10:18 PM 2003 chevy 2500hd duramax quadcab schulte 10-04-2007, 10:28 PM Seperate fuse for the LR+RR brake lights; it's in the fuse panel inside the drivers door. By LF I hope you mean left rear, unless your truck has those new-fangled front brake lights... quadracer_pimp 10-04-2007, 10:48 PM just tried that and nothing changed...still stumped... quadracer_pimp 10-04-2007, 11:00 PM the left light stopped working about 3 weeks prior to the right light stop working...tried changing bulbs and checked fuses... all were good so i ordered a brakelight switch and that didnt work either... heymccall 10-04-2007, 11:01 PM Make sure you checked the correct fuses. You have: Lt brk Rt brk Lt trl Rt trl quadracer_pimp 10-04-2007, 11:08 PM tried all of them listed and nothing changed schulte 10-04-2007, 11:13 PM Time to break out the test light... start at the pedal switch and go from there... fuse hot side, fuse load side, light socket... quadracer_pimp 10-04-2007, 11:20 PM OUCH!!! LOL... i didn't wanna hear that but i gotta find out so i dont have to worry bout a YUGO tryn to check my rear end out....hahaha Tmalafa 10-04-2007, 11:55 PM If you have a towing package follow the wires back the the main wires could be a bad connection,. I lost my running lights to my trailer at that connection. I hope this will help. Tolliwacker 10-05-2007, 01:23 PM It is a "CrewCab" not a "QuadCab", so that might be your problem? No really, I had a 96 Blazer and stuff quit working, and it turned out to be a Multifunction switch located somewhere around the steering column, I DO NOT KNOW if this is applicable to these trucks, but that was a thought that comes to my mind. sritchie 12-29-2007, 06:32 PM I am having the exact problem with my 2006. Chased the wires and fuses and see that there is a separate circuit to the trailer connection that works fine (as does the center brake light). It seems that the dedicated tail light circuit for stop lights is dead, although the turn signals (same bulbs) work fine??? Seems to me that it has to be in the control for the turn/brake signal circuit. Anyone? heymccall 12-30-2007, 02:03 AM Search "flasher module" as it affects trailer lamp operation or mis-operation. Arcing 12-30-2007, 04:36 AM 2003 Chev/GMC wire diagram It might be the grounds are common and the problem. sritchie 01-02-2008, 01:14 AM Thanks Arcing. After I posted, I looked in my 1999 Silverado service manual, and the wiring is identical! I chased the power through the junction blocks and found that the brake lights had power when the brakes were applied. I had previously inspected the bulbs and the filaments were good. However, when I unplugged and replugged the bulb the light came on! Same with the other side... I was debating checking the ground side of the bulbs, What are the odds of both bulbs being bad, I thought. Well, its fixed now, and if the problem comes back I will try new bulbs. | ||