[D.PASSMORE]

The horn contacts under the horn button and as pictured is the negative (- / black) side of the circuit for the horn system. For positive (+ / red) side to the circuit to relay (under the dash) is a un-fused direct source coming from fuse box. The Green wire is the direct power wire to the horn (s) which are grounded to frame. When you push horn button, the thin metal disc that rides on the plastic collar inside the wheel touches the ground area (pictured), thus completing the circuit - which activates the relay, which the sends 12 VDC to horn(s), which then they sounds off. The Trick - is ensure that all contacts in the wheel are making contact. And when you screw down the three screws, ensure the thin metal disk is center in all three holes and is riding on the collar. Start screwing down the screws a turn at a time, alternating between them, push down the on the metal cup as you go to ensure the horn / relay is working. It will snug up as design if every thing is lined up correctly. The main issue I've had is over tightening the screws which will not allow the thin metal disk to spring back after it is pushed in with horn button. When that happens, you have to start over as described. That how I figured it out, hope it helps. D/