Check around the trailer connector for a short; plus under the bumper is a harness that splits off the taillights so take a circuit tester and check for shorts here also. turn signal switch assembly worn out try another one third light is not wired throguh this switch but the two brake lights are the switch cancels the brakes for turn signals and hazards, it wears out eventually
Could be a blown fuse Check the stop light switch usually located at the upper end of the brake pedal under dash are for operation and alignment Could be a blown fuse Check the stop light switch usually located at the upper end of the brake pedal under dash are for operation and alignment
Check bulbs Check switch
If the brake lights on a vehicle do not work on one side, this could be an indication of a blown bulb. Also, some vehicles have front lights that affect the rear lights, so checking for problems in the front lights could help as well.
brake relay or sensor
Blown fuse. Your brake lights don't work either.
Blown fuse
if the tail lights work but not brake lights then its most likely just a blown fuse or it could be the switch at the top of your brake pedal arm.
If the center one works then it will almost certainly be 2 Blown globes.
A blown bulb. Check fuses and then start replacing the bulbs one by one.
The GMC dash tail and parking lights are on a different fuse from the brake lights. Check the fuses for a possible blown fuse.
If you have no brake lights or tail lights then you've probably got an electrical problem. Check the fuses first and see if you have one or more blown.
You may have blown a fuse. You may have to replace your brake light switch which is located above the brake pedal under the dash. Also it could be your emergency flasher knob if its broken. All of your turn signals and break lights run through it and if the connections on it are off none of the brake lights and turn signals will work.
You may have blown a fuse. Check your fuses. Then you can check your light connections.
Blown fuse or bad headlight switch
blown fuse or turn switch bad
How do you replace brake lights
Possibly blown fuse, bad brake light switch, or blown brake light bulbs.