HHOOOO boy. I dont think I can solve it but here's a few thoughts. My Newells have had a 12V automobile horn that works simultaneously with the air horn..If the coach is not "aired up" it's hard to hear the 12V. I think it's on the front bulkhead just behind the front bumper. I'd start there. A critter could have chewed some wiring....
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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