If it only has one wire running to it the ground is where it is bolted onto the vehicle. It sounds like a weak/bad ground, either some corrosion has built up there or it is just loose and some crap from the mud and washing may be the culprit. Remove the horn at the mounting bracket, clean both mating surfaces with a wire brush or sandpaper and reinstall, also be sure the wire connection is clean and solid. I think you might be OK....<><.... :grin: