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I have no brake lights on my 96 GMC Sierra. I have tailights and back up lights, signal lights and hazards but no tailights. I have allready replaced the bulbs, circuit boards, brake light switch and relays with no luck.
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Check your Tailight fuse to see if it's blown, if so then start checking for a bad bulb(shorted element) in tailight circuit boards . and also don't forget to check grounds as well, there should be one at rear frame by left (drivers Side) tailight connection/trailer harness connection. hope this helps. do your Brake lights Work ?
Try wiggling the hazard light switch while pressing on the brakes.The taillights are connected to the turn signal switch before it goes to the brake switch.The contacts on the hazard switch are probably dirty(I remember this problem years ago,same symptoms-3rd light works but l/R tailights not working).You may just be able to turn the hazards on+off a bunch of times to clean the contacts instead of replacing the switch.
OK if the fuses are good , use a test light and check to be sure you have power at the fuse terminals. you'll check from ground to the terminal on top of the fuse. you should have 12vdc. then , check for power at your brake light switch on both terminals while the brake pedal is pressed, it is located located on the brake pedal assembly. also , check your hazard flasher switch to be sure it is not on. if it was on, check your flashers, both the turn signal and hazard flasher. If everything checks out , your problem is probably in your turn signal switch assembly located in your steering column.
The tailight markers and plate lights are wired together. A fuse to the marker lights or sometimes called,park lights, may be blown. You may have a naked hot wire rubbing metal. Sometimes SUV's have trouble with trailer light plus also that ground out the circuit.
Sounds like a short in the steering colume, maybe the turn signal switch, or a wire that the insulation got wore thru in the colume. Unhook break light switch and try the turn signals and hazards again and see what happens, maybe you can isolate it that way. Also if you havent done it already chk.the sockets in tailight housing for corrosion and bear wires, or anything, even ground wires.
If you still have this problem maybe this will help. I had to replace the trailer plug on a 93 GMC Sierra K1500 and had a problem with the light's not working. Had to trace wires from trailer plug up to tail lights. The problem was a broken ground wire. It took longer to remove all the tape and replace it than fixing the problem.
it seems you have a short in either one of the lights or interlock. all are connected to the same fuse. trace the wiring from the fuse box back to the component. Using a test light test in between the wires. check for any obvious breaks in the wiring.
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