Had the same problem. I would get a multimeter and start a little troubleshooting. So in saying that, how far did you go in taking the steering column apart... I agree with BD in checking to see if the pin fell out of the cancelling cam, it is basically a plastic slip ring that has a plastic pin housing that protrudes up between the lock plate and plastic cover plate once you pull the steering wheel off. The metal pin that BD was talking about is spring loaded. If the spring is missing then the metal pin would fall back down into the pin housing. If it's not touching the metal back side of the steering wheel then it will not complete the circuit.
If that is all good did you disconnect the Turn Signal Switch? It will be the slim harness with about 7 to 8 wires for the blinkers and Horn. Recheck to make sure its seated properly, then take your multimeter with extensions starting at the actual horn which is Dark Green. I like to use the audible on the multimeter when doing a continuity check. Hook one end to the dark green and trace it to the fuse box, if you get an audible that portion of the wire is good. Then leave the multimeter hooked up to the fuse box and take your other end into the cab and find the black wire on the turn signal switch, which is for the horn, if you get an audible then you know the deal that portion of the harness is good.
Now leave the end hooked to the black horn wire and depending on how your steering wheel hooks up to the horn pad it may have a green wire. Touch it with the other end of the multimeter and if you get an audible then the entire circuit is good. also if the horn pad has a metal tab protruding from it, it might need to be pulled out to make contact with the shaft when laying on the horn for them slow driver.
Hope this helps. I try to be detailed since this is a forum for helping out.
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