Figured I would try to help with your horn.......at the steering wheel the wire in there is the ground, so you won't get "juice" there. Check at the horn itself if one of those wires is 24 volt, the other wire will lead through the harness back to the bottom of the steering column.....if you aren't getting power at the horn itself next check the small breaker on the firewall, drivers side by the column, will be oval, 2 screws holding it on and 2 wires....you can pull them off and make sure one of them is getting 24 volts, plug that one back in and check the other side of the breaker to see if 24 volts is going through it.....if not you need a new one of those......if all that checks out and still nothing then take the wire at the bottom of the steering box and touch it to ground....horn should blow, if it does than the problem is either in the horn button or the wire going up the column is broke.