Does it blow when you turn the key on or just after starting the bike? If not when turning the key on, turn the key on and see if all the electrical works, turn signals, stop lights, horn, high beam, kill switch on and off. If something does not work, or when you try it the fuse blows, then there is your problem. Check for a good battery ground. After that you may need a multi-meter or VTVM to start tracing wires to ground.