A loose screw got in the cigar lighter and shorted it out, blowing the fuse. This is the same fuse that the horn and speed controller (cruise) is on. After replacing the fuse, cruise and the cigar lighter work, but the horn still doesn't. Instead, I hear a clicking sound coming from the right side of the dash when I press the horn. Is there a relay in that vicinity that may be blown, or is my horn shot?

BTW, it's on a '90 F150 Lariat.

 

I would first hook up a test light to the horn wire. If it lights up I would just get a new horn. If it does not light up then you may have to replace the relay, but I can't help you there.