2003 Ford Expedition start problems

Answer 1

In this case, the starter was the problem after 55K miles. While driving on freeway, the instrument cluster of lights flashed momentarily and then the car went dead. After coasting to the side of road, the electrical system worked fine, but the car wouldn't start. Not sure why a bad starter caused the car to go dead while driving. After inspecting and cleaning all electrical connections from the battery to the starter, and checking all related fuses and relays, I came to the conclusion that the starter motor must have gone bad. I replaced the starter motor and the car started right up. See "How to replace the starter motor."