FAULTY ELECTRICAL SYSTEM IS BLAMED FOR THE FOLLOWING SITUATION. VEHICLE'S OIL LIGHT CAME ON AND VEHICLE SHUT OFF AND WOULD NOT RESTART FOR SEVERAL HOURS. 15 DAYS LATER, THE GAS LIGHT CAME ON AND THE VEHICLE SHUT OFF. DRIVER GOT OUT AFTER REALIZING THAT THE ENGINE WAS ON FIRE. THE TRUCK RESTARTED ON ITS OWN AND PROCEEDED ACROSS A FOUR LANE HIGHWAY.