Was just helping my Father-in-law work on his ‘92 C1500. Had no brake lights and hazards were not working. The “STOP” fuse was blowing - sometimes after the brake was activated, and sometimes as soon as plugging in a new fuse. In trying to remove the fuse panel to check on wiring connections on the back we discovered that the hazard flasher (makes the ticking noise when the hazards are on) was broken and shorted out. We took the flasher out and the brake lights work great. Put the flasher back in and the hazards came on immediately but stayed on. The clear case around the flasher had broken and the copper was resting on some other ground point. I think it shorted the circuitry inside. So, off to the store to get a flasher. Glad we didn’t tear all the wiring out of the truck like we talked about doing.