ive had this exact problem on both of mine..... inside the plastic case on the handle bar, the wires came loose. like under where the lil button is. i dont know if this is a common problem or what... so just make sure all the wires are secure first, then go from there
Pulled the rad cover off, and the horn was unhooked. Plugged it in, and it just made a click. Grabbed the meter and discovered it was draining the battery, now wonder previous owner unhooked it. Went to the dealer where I bought it, Overturf in Springfield, they gave me a new horn. Now I'm just waiting for it to come in.