when ya hit the horn try to listen for the horn relay clicking under the dash. it's on the pass side of the steering column. you could also go to the horns themselves and give em 12v. they're case grounded. fuse, relay, horns, contact in the button or wiring....not much else to it.
k well then you know the fuse is good, also the column part of it is good too along with the relay....well you should check for 12v out of the relay actually. go to the horns themselves and give em 12v (case grounded unit). if they work, you have a bad wire between the relay and the horns. try getting a wiring schematic on the horns....it'll save you alot of time and curse words