Study the Wiring diagram I linked. Find the wire coming out of the column and wire it per my suggestion. Maybe ignore what you think your harness says. It sounds like you are wanting to connect hot to the horn button. I don't think that is correct. If you have the normal horn button in center of steering wheel, it should have that wire I mentioned.
"My wire for the horn exits on the other side of the fire wall down by the steering box."
Let us know what both ends of this wire are connected to? or if only one end is connect, what it is connected to.
Your harness diagram/info may be thinking you have a relay. In which case the wiring is different than what I said/linked. Maybe that's where the confusion is. You need to see if you have or want a horn relay involved.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
| 
