So, here's the deal: r/r stop,turn, hazard don't work. No voltage to the back of the truck. bulbs (sealed unit) good,fuses good, running light works. I've disconnected the plug from the turn switch and run B+ to each terminal everything functions as it should except for the r/r lamp. Any suggestions, thoughts, questions? The wiring diagram shows one fuse for each side. I can only find 1 fuse under the hood. The fuse box under the drivers seat has nothing to do with chassis lighting. Diagram also shows everything runs through the Body Control Module and shows printed circuit board relays under the chassis fuse box for the brake/turn lights. It says they aren't serviceable. They are replaceable, no?