all lights go out 5 minutes down the road?
when the truck is running and driving lights were on and working. 5 minutes or so later, all lights/electronics shut off in the truck yet continued to run the engine. letting go of the gas pedal turned on everything temporarily, then shut back off when pushing on the gas one time. after that the lights stayed off, and the engine continued running and driving. wiring? maybe? its a 1989 gmc sierra 2500.