Update:
There is a 3rd wire harness next to the ignition sw. Remove lower center compartmen to gain access for your hand. Plugged in the horn switch and 'Bingo' ( had to turn out small screw under a black plug on horn to get it to beep)
Hope this helps

Same problem as above, I tried both harnenesses with no luck ( it does light up). I will be looking for a 3rd harness, also will be checking the wiring. The center 2 wires of the connector are 12 volts, but the only N.O. contact on the switch are the top 2 terminals, so I don't understand how it would energize the horn relay. I'll update if I find solution.