I have a 1981 cb400t, and the only thing holding it back from passing my state's safety inspection is the tailight. The brake light works fine but the taillight does not, fuse keeps blowing out. I've been chasing wires from the headlight and associated harnesses to the fuse box and the tailight itself with no luck. I have found that the fuse burns out regardless of whether or not the taillight bulb is in the socket, and at this point I'm curious if the problem lies with the ignition switch, since the diagram shows it as the power source for the light. Any ideas?