Horn not working

[Kantosensei]

When I depress my horn button I get a clicking noise under the dash, but the horn doesn't blow. Is there a simple test to check the horn or is there a relay that could be bad. My horn was working, then I changed my entire under dash wiring harness, I thought i had checked everything after changing it and am pretty sure it was everything was working. I had two horns under the hood and two horn wires (green). One of the wires has a double terminal and is not hot. The other is a single terminal and is hot (12 volts when button is depressed). I know for sure that only one horn has ever worked. Is it possible that the horn is not grounded? I have scuffed the paint to bare metal. Is it possible that the horn would just die?? I am totally baffled and need to go to inspection. Any ideas would be greatly appreciated. Thanks David