4C,
I'm not much more useful than a wet blanket, but that wire on your steering column...there should be a black wire coming up thru one of the holes on either side. It would attatch to the ring in the center. this would just tie everything to gound so when you hit the horn, it would work. Now just where that wire comes from, I can't tell you, but I do know it's tied to ground, so maybe you can rig something up?
Mike