Well, I stood outside the truck and started to push on the seat to simulate someone sitting on it to see where the power seat stopped working. When I pressed on the seat back the power seat stopped working. I had the lumbar support fully inflated. I changed it to 3/4ths inflated and, knock on wood, the power seat now works when I sit on it. There must be a loose connection that is pulled when someone sits on the seat with the lumbar support fully extended.