It was a ground problem. I hooked up a ground wire from the taillight housing to the frame and the brake light came on-constantly! even with the brake off. My brake switch tested out O.K. on the bench but in the truck the lever didn't come back enough to shut off. Stuck some 1/4" hose over the lever and now it works fine. Maybe that's why the p.o. yanked the tail wires to begin with. Thanks