I just finished putting the 81 back together after getting it painted and now I do not have any tail lights, the headlights still work. The brake lights, blinkers, reverse lights all still work just the running lights will not come on. Only thing I removed electrically from the truck was an aftermarket cruise control system that someone had installed. We checked the power at the light switch and it is good. No power at the rear plug, could it just be an open between the switch and the rear plug? Thanks for any help.