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FWIW, just tested a new Fiamm Freeway Blaster horn and it draws 4.45 amps direct from my spare boat battery, and IS loud, lo tone. The BA horn fuse is 10 amps, which tells me that the stock wiring should support a single Fiamm horn quite well. Dual horns will absolutely need a relay circuit, though, as will any compressor type horn.
The fuse you're referring to powers more than just the horn (I don't remember what, offhand). The problem in any event isn't the fuse, it's the horn button. 4.5A might shorten its life. Did you measure the draw with the stock horn?
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
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