Ford chassis' don't have an air compressor from the factory so your air compressor was probably added by the previous owner or the coach builder. Look for an inline fuse from the air compressor to a hot connection. I wouldn't think Ford the had a fuse position for the air horn. More than likely a stuck horn relay. If you can locate it, they aren't very expensive.
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2019 Horizon 42Q
Cummins L-9 450 HP
Maxim Chassis / IFS with Tag
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