[jocko]

not sure, but my guess would be that it's somehow making continuous contact - and that can happen if you forgot to put that little plastic ring thingy in that the 3 screws go through. Do you remember putting that plastic part in when you installed the turn signal wiring and put the new steering wheel back on? (you probably did remember, but I wouldn't be asking if I hadn't done it myself.... almost went deaf before I could get the battery disconnected so I could work on it to fix it). Could also be the order in which the plastic ring was installed - it should keep the metal from touching until the horn button is pressed. Sounds annoying (no pun intended) - good luck.