Last winter my horn stopped working, then once spring hit and it got warm it started to work again. Now that fall is hittin and its cold out again my horn has stopped working. I have a new horn and a new relay, the fuses arent blown. This has made me come to the conclusion that the wiring is to blame. Can i run a new wire from the relay directly to the horn, how should i fix the wiring, which wires should i run where?

Since you replaced all the other parts I would look @ the wiring, Must be a short some where, You can also run a new wire to the horn button (switch).

Good Luck.