Brake lights stay on, hazards won't flash

[volunteerff21]

My brake lights are staying on even when the truck is off. When I push the hazard button the lights all come on but do not flash. Right turn signal does the same thing. Left turn signal works fine. When I try and use the hazards or right turn signal I get a brief "buzz" coming from somewhere under the dash. I have my door dinger pulled so it's not that. So far I have replaced the flasher unit under the dash, brake switch, and the turn signal/hazard switch. I've tried pulling every fuse and relay I can find for the brake lights but they refuse to turn off. Any one have any ideas? I'm guessing there is a crossed wire somewhere under the dash but I'd really like to try other possibilities before I start tearing the dash apart.

 

[94Sierra4x4]

Have a good look at the trailer wiring harness at the rear of truck, pretty well had an identical situation with the hazards, but my brakes light stayed off.

Check for bad grounds.. broken wires..etc

 

[volunteerff21]

Have a good look at the trailer wiring harness at the rear of truck, pretty well had an identical situation with the hazards, but my brakes light stayed off.

Check for bad grounds.. broken wires..etc

Thanks a bunch! That turned out to be it. I couldn't believe the amount of rust and corrosion I found inside the plug. I ended up replacing both the plug and about 4" of wire just to be safe.