I started wiring my Toad, and I noticed I have no Left Signal or Brake light. There is no voltage at the plug on the rear of the bus for the Left signal or left brake light. I checked the breakers/fuses in the panel over the engine. The 7.5 amp fuse that says Left signal and brake was blown so I changed it. It hasn't blown again. Any suggestions? Is there a relay in the circuit? The Right signal and right brake light works and the parking lights work on both sides.