A switch will not cause fuses to blow. If it has bad contacts, which is an open circuit, no current will flow to the affected circuit, so that circuit will be dead, but no blown fuse. If a switch were to short, which basically means it is stuck turned on, the circuit would simply turn on when you don't want it to. There is no other defect causing current to be too high, so no blown fuse.
What you are describing is a short somewhere else in the circuit. For a tail light problem, look first for chewed up wires going to a trailer connector, and mangled wires in the trunk.
Monday, February 22nd, 2016 AT 9:50 AM