papapavs1
Junior Member
- Joined
- Apr 13, 2024
- Posts
- 9
- Reaction score
- 1
- Location
- wisconsin
- First Name
- avery
- Truck Year
- 1979
- Truck Model
- c10
- Engine Size
- 305
Hello, 1978 GMC K25 fleetside. After doing quite a bit of work to the truck, I now have no brake lights. I did a new ignition switch, ignition lock cylinder, and had the box pulled a few feet back for paint. All lights worked fine before this. Tails and Turn signals still work fine. I jumped the brake switch and I have 12v back to the socket. I cleaned up the ground behind the drivers light housing, and even added a ground from the box to the frame, still to no avail. I also unplugged the rear wire harness at the firewall and ran 12v straight from the battery to it to eliminate it possibly being a turn signal assembly issue. Reviewing wire diagrams shows that the ground behind the drivers side housing is the only ground for the lights back there