Bulbs will burn out long before fuses will.Voltages in cars are so low that only a short circuit will blow a fuse.The owners manual should tell you what number bulb and where it goes.Most just plug into the socket.There is also a small switch on the brake pedal that can go out of adjustment.Once a month walk around the car and make sure all lamps are burning.A mirrored building is an easy way to check taillights.Most are no bigger than a flashlight bulb.