Thanks for your technical info and sharing your mods with us. I also installed my air horn in the engine bay. In the process, I think I blew the horn fuse, but looking into the fuse block, the only fuse related to the horn is a 60amp Horn/Lighting fuse. All systems work fine except the horn so I dont think it is the 60amp fuse. I cannot find a smaller 15 or 20? amp fuse. Any ideas? Thanks for your help. See photo of my fuse block map.