Headlight not working

Welcome to 2CarPros. Which light doesn't work? Passenger or drivers side? Do you mean the fog lights don't work or that when you use low beam they don't come on? The way the stock lamps normally work is that the fog lights only will work on low beam, then go off with the high beams. Does your truck have the automatic lamps or a manual switch? Does it have daytime running lights? The wiring and parts used are different so the answers will help track it down.