I have a 1988 FLTC that I stripped down to an FLHS. For the last ten years I have been having an off and on problem with the horn. I extended the wire to the horn and that fixed it for awhile. Most of the time it has been a grounding problem. I found that the stock ground wire had rusted into. I haven't been able to ride my Harley for a few months but when I had to stop the horn worked fine. Got the bike going again and the same old problem. When I push the horn button I get a 'thump' sound from the horn. I bought a new horn and it still only makes the 'thump' sound. Any ideas as to the problem?