Gmc Sierra Third Brake Light Not Working

My interior light and cargo light bulbs work.

Gmc sierra third brake light not working.

Chevy truck forum silverado sierra gmc truck forums. Feb 23 2014 3 08am. I m not sure if it s the switches in the door jamb a fuse or what. If your third brake light works either way but the rear brake lights stop working when the truck is on its a faulty ground wire to the stop lamp relay.

3rd brake light and cargo lights not working. A blue wire connects the brake lights switch to the rear lamps junction block. 2003 gmc sierra 3500 6 0 v8 gas. That s my next project.

If electrical current is reaching the switch but the lights are not working even if the switch is in good condition follow the current flow with your test light to the stop lamps and look for a possible open or short in the circuit. I checked the following fuses for current. I noticed the third brake light is not working. If only the third brake light or the lower two lights work start by checking the circuit fuses first.

Interior fuses 12 stoplamps center high mounted stoplamp worked fine. Remove the screws from the bulb lens which you can access through the trunk or see your vehicle repair manual to get the exact location. Other things use that ground when the key is on so its not strong enough then to activate the armature within the relay. I can not interpret fues box lables to check fuses.

The two bulbs under the dash do not. Third brake light not working. The possible reasons for brake lights not working but tail lights are. If at least one brake light works but one or two others don t troubleshooting is relatively easier than dealing with a circuit where none of the lights work.

Yes i need help brake lights work with doors open or closed with brake pedal on just the third brake light does not work when ignition is on and doors are closed. I m hoping for an oddly named fuse or relay. Lol i haven t located a bad fuse. None of the lights come on when i open my doors.