OK guys after 4 years I finally got around to wiring a Bad Boy Air Horn on my bike. I've installed about 30 now for a few friends and riders by disconnecting the stock horn connector then running wires back up from the connector to trigger a relay I supplied 12 volts to inside the headlight nacelle. I figured there has got to be an easier way so I tried just tapping the horn wire from the horn switch black with blue tracer wire but it rest at ground and would trigger the horn with the key off. Well being this was my bike I took my time looked over the schematic and figured it out. So now you don't have to catch the wires from the horn connector you can catch the trigger wires from the headlight nacelle. Still have to run a power wire from the battery but hey this is easier.
You can do the following by wiring the way stated.
Air Horn Only: Cut the black wire with blue tracer. Tape off wire going to Horn. Connect switch side of wire to terminal 86 of relay.This will eliminate the stock horn with out disconnecting the harness from it.
Air Horn and Stock Horn:In my case I installed in the stock horn location a high output electric car horn. A pain in the A$$ to squeeze it in but I'm happy with it even more now with the added air horn. Just tap black wire with blue tracer.
Air Horn or Stock Horn via Switch: See Diagram Below
No Matter what you do this will remain the same
You can connect the 85 terminal of the relay to the orange with green tracer wire (it's the same wire that goes to the horn)going to the Tachometer.It also feeds the start switch and speedometer. It's inside the headlight nacelle. No need to go all the way to the horn and fish wires back up.
For your Battery power wire running to the Relay,Air Horn, and Ground please use a minimum 14 AWG wire. Fuse it with a 25 AMP fuse at the battery.
Air Horn Only
Air Horn with Stock Horn.Both on at same time.
with switch to turn air horn off or on .
Air Horn with Stock Horn Switched. Either or.
Hope this helps you guys out. Enjoy and Ride Safe!