I got a set of "Mayhem" handlebars from Witchdoctors and installed them a few days ago. (They're awesome, by the way.) The install went fairly easy but when I got it back together, my horn didn't work. My first thought was that I had somehow messed up the switch. So I took the controls off the bars and checked it out. Everything seemed fine. Put it back together and checked the fuse. Fine too. So then I unplugged the harness and checked for power. All good there. Checked for continuity running from the harness and through the switch. Good again. So all that was left is A. the wire from the harness going to the horn was broken, B. the ground connection for the horn was broken, or C. the horn itself was damaged. I was tired and didn't want to check those options so I decided to put it off till later. Well, I took the bike out for a spin today and the horn magically works again. Don't know why, but I don't think I'll mess with it unless it goes out again.