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I was not considering an electric compressor. Most guys who are really
serious about air horns (truckers, military vehicles, etc) use a compressor
driven by a belt from the engine, usually the same one that supplies the air
brakes. If there is a horn button, it operates a solenoid valve which is
usually not too big a current draw.
When I was using an air horn I used propane to blow it and it worked GREAT
until the hose, too near the battery, got a hole in it. Propane was pretty
much a surplus product in those days.
--
George Downs Bartlesville, Heart of the USA!
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