With the wheel in place, pop off the horn assembly and cross the wires from the horn assembly. If the horn still doesn't work then:
There are two springs that touch a metal disk behind your steering wheel plate. The springs are embeded within your turn signal assembly. Make sure that those two springs are present and that they didn't melt in half due to an over load. I took two springs from a ball point pen and they worked fine. Clean off the metal disc of all debre. You'll see that it's plastic coated with two bands of copper, it kind of looks like Saturns rings. There is a ring of plastic that ensures that the two copper rings don't touch, the rings are suppose to touch the ball point pen springs, coming from the blinker assembly. Refer to the picture below. The wires to your horn button come off of that disk. If you have horn power from the wires coming into the colum but not at the horn button then it's most likely these springs. If you're like me, then you probably already figured it out by the time I wrote all of this.
Send me a pm with your phone number and I can call you and talk you through it, kinda hard to write it all out.