Brake lights don't work. Fuse is good, bulb is good, but brakes still won't come on. GMC Sonoma 1994.

Could be break light switch or relay.

Check brake light fuse first. If ok, the brake light switch at the brake pedal may be defective. Try wiggling the switch to see if the brake lights work. If not, disconnect the wiring connecter and if it is just 2 wires cross them over and see if the brake lights come on. If they do, the brake light switch is bad. If wiggling the switch makes the brake lights work, I would suggest a brake light switch as well

The cargo light will only work if the lights in the cab are on. Turn them on then flip the switch for the cargo light and it should come on, if not then it is probably an electrical problem.

sounds like it could be a blown fuse or possibly a loose wiring harness plug . or could be you didn't get the bulbs reinstalled properly I've seen it all so don't be offended . good luck

check the fuse .and all of the bulbs are working.if ok then change the brake switch.

if the third brake light is working and the left and right brake lights are not than the most likely problem is the turn signal multifunction switch.

If the third brake light is also not working and the bulb is good than check the brake light switch located above the brake pedal under the dash. There should be power on one wire all the time. There should be another wire that powers up with the brake pedal depressed. If no wires power up with the pedal depressed than the switch is bad.

I can get you specific wire information if you need it. Just let me know.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

check for a bad brake light fuse! if not the fuse, the brake light switch operates brake lights and if bad you will not be able to shift it out of park, as well as the brake lights not coming on.! because you have to put foot on brake to do so. if bad switch, it wont let it out of park. it could be just out of adjustment also!! good-day !

IT SOUNDS LIKE YOUR FLASHER FUSE IS DEFECTIVE. IT WORKS BOTH HAZARDS AND TURN SIGNALS. YOUR LOCAL PARTS STORE SHOULD HAVE IT VERY CHEAP

This may sound too simple, but first verify that you are getting voltage to the light socket. Use meter on d.c. If you are getting voltage, and your bulb is good, it could be a bad ground. Don't overlook the brake light system goes through the directional signal in the steering column.

yes , i have a 96 mine done the same thing , i was removing the dash cover to install a radio accidently broke mine , i had to push down on what remained and wedged a sheetrock screw to hold it in place till i could get a new one