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.
Gmc sierra 3rd brake light not working.
My interior light and cargo light bulbs work.
I think they are supposed to.
Feb 23 2014 3 08am.
I can not interpret fues box lables to check fuses.
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.
I m hoping for an oddly named fuse or relay.
The two bulbs under the dash do not.
2003 gmc sierra 3500 6 0 v8 gas.
Other things use that ground when the key is on so its not strong enough then to activate the armature within the relay.
Third brake light not working.
3rd brake light and cargo lights not working.
None of the lights come on when i open my doors.
That s my next project.
Lol i haven t located a bad fuse.
I noticed the third brake light is not working.
I m not sure if it s the switches in the door jamb a fuse or what.
I checked the following fuses for current.
Hi i just bought a 2009 chevrolet silverado 1500.
A blue wire connects the brake lights switch to the rear lamps junction block.
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.
Interior fuses 12 stoplamps center high mounted stoplamp worked fine.
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.