I have an LED tail light bulb... I wonder if that would have something to do with it?!? Although I do believe it didn't blow fuses when I first installed that. Maybe I should trace the horn wires. Did you find exposed copper in your horn wires that had the potential to short?I had this problem on my 749 and it appears to have been corrected by adjusting the horn wires. Perhaps while riding, one of the wires vibrated against the frame and shorted. After checking the starter and tail light for problems, and finding none, the horn seems to be the only other path in the 20A circuit. No fuse blown since this 'fix'.