They don't, that is the worst part, they used to, now everything is contracted out, supposedly saves the government money, but makes some poytickian mad money. We don't really fix our own stuff anymore, but there are plenty of civilian contractors out there making 6 digits a year doing the same job they spent money training me how to do, while paying me a fraction of that. on to other things, I am pulling the entire rear wiring harness, and re-wiring the whole thing. I'm going to cut it all out, rear light wise, and start over. I have the wire for it. At least this way I can find the short for sure. power is getting in where it shouldn't, and not getting to where it should. as I understand from the schematics that I do have, all wiring goes through the fuse box in the engine bay before going to the rear of the truck, or at least the turn signals do anyway. Gentlemen, I have the zip-ties, I can rebuild her, stronger, better, faster. *montage*