Connect horn to horn ground wire and direct to battery with scrap wire..
works the same as a test lamp except it may startle the
ooh: out of you.
easy way to confirm ground is good..
you can make a test lamp with any 12V auto lamp and a socket or solder iron and scrap wire.
salvaged broken turn signal would work too.
I didn't see which bike Gen1 or Gen2 you have, or the CC..
Makes a difference as the horn circuit is different.
Gen 1 power from Main fuse to ignition switch via red wire to horn switch via black wire horn switch to horn via light green wire to ground via dark green wire.
Gen 2 power from main fuse to ignition switch via red/black wire to turn/horn fuse black wire from fuse to starter button, main lighting "stop, turn, running, and speedo lamp" and Horn circuit.
So if bike starts, lights light than you have a broken wire between horn button and where black power wire is connected to wire harness or green wire from horn button to horn.
having the proper wiring schematic should help you out. They are all available here on the forum.
sorry if i missed your year, model elsewhere in the posts.
96 VS800GL Suzuki Intruder, 87 CMX250C Rebel,
79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
Help others help you, Include Year and Displacement in your signature...