Not an electrician, but had good luck with trial and error. Horn relay get's
ground from horn-button. Relay getting ground then sends +12v to the horns.
You should be able to identify the wires on the relay, unhook and 'test
touch' them to send the +12v feed for the relay directly to the horns,
bypassing the relay. If new fuse blows, the problem is down stream.
Otherwise, with horns unhooked, +12v reconnected to relay, and test light on
terminal for horns, horn-button should make test light glow. If fuse blows,
sounds like bad relay.
There's really nothing magic about the whole horn system. Steering column
must have ground, horn-push must provide ground to relay when pushed, relay
must have constant +12v and operate, horns must have ground and good
connection for +12v from relay, horns must work.
>Everytime I hit the horn, the fuse blows. I've not made any changes for a