TRUCK WAS STOPPED & LEFT RUNNING, DRIVER AND PASSENGER GOT OUT TO SEE IF ROAD TOO MUDDY TO DRIVE ON. WHEN OPENED DOOR LESS THAN 1 MINUTE LATER, TRUCK FILLED WITH SMOKE. FIRE SMELLED ELECTRICAL, BATTERY UNHOOKED, VEHICLE TOWED TO FORD DEALERSHIP. APPARENTLY WIRE ON POWER WINDOW ON PASSENGER SIDE TOUCHED METAL AND STARTED THE FIRE. THIS VEHICLE HAS NEVER BEEN WRECKED AND DOOR OR WINDOWS WORKED ON. WHAT WOULD MAKE IT SHORT OUT AND START FIRE IF NOT FACTORY DEFECT. DT