connecting horn on aftermarket steering wheels

Im a bit confused as the wheel appears to have two horn connections but the hub came with only one wire in the harness. Any help or insight would be greatly appreciated. Im about to put in an Isotta Katiena steering wheel and a Bell Works hub. Is this correct? There doesn't appear to be any other wiring to provide the ground to make the horn switch-to-horn relay circuit complete. Also, my assumption is that the steering column /shaft is grounded. Was hoping not to have to take apart the steering column. How do I get power from the connector at the base of the steering column to the spring loaded pin? There is a wire coming out of the connector heading up the steering column, but no luck with power at the pin. I've tried to check the spring loaded pin that contacts the copper ring on the back of the wheel mounting hub to provide power, but there doesn't seem to be power there. I've been able to determine that the horn switch needs two wires, one for power and one for ground to make the horn relay activate the horn. remove steering column covers and under dash cover 3. I've installed a new horn relay and horn, checked all wiring to the harness connector at the base of the steering column and everything works. remove your aftermarket steering wheel and hub 2. The other cables you have connect to the terminals on the back of the horn switch using the colour codes above. Having trouble wiring up the horn switch for an aftermarket steering wheel for a 1972 Ford F-100 truck. The wire with the fuse in is a device to fool the car to think it has the steering wheel airbag fitted, you need two of these to connect to the two circuits above.

Connecting horn on aftermarket steering wheels