My S185 "had" an issue blowing fuses, etc, and here is what I have found. Make sure the fuse "alt" is not blown, but I will assume you have already done this. Make sure you have +12v to ground at switch's with machine running. Next, knowing fuse is good, alarm is wired and works as you stated: run a temporary single wire from battery + to the wire on the switch(s) that leads to the horn. If you do not know, one should be +12v from "alt" fuse, one wire jumps the two switch's together, one leads down the harness on side of machine. Touch them all one by one , no damage can be done. If you get horn, double check power to switch's, and/or switch's are shot. If you get nuthin yet, I would bet problem is in the harness. Sad but I think this is quit common. Look for a pinch point and I bet you will see what Im talking about. Good Luck, Bruce