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Originally Posted by Ken B
"...Replaced the fuse, tried all the connections and it still doesn't work. Any thoughts...?"
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Is this an air horn or an electric horn?
Did you replace a good fuse or a blown fuse?
Does the horn "click", or make any sound at all?
A blown fuse should indicate a bad horn, switch, or an intermittant "swinging short" in the wiring. I'd start in the middle—at the horn button.
If dash-mounted, the back of the switch should have two terminals: try using a connector across those two terminals with the ignition on. The horn should work then, although the fuse could blow again if the problem is the horn or between the switch and the horn.
Otherwise, remove the horn itself and jump the terminals
firmly at the battery. Use insulated tools, as there can be a minor but uncomfortable shock generated. (Also, sometimes a horn benefits from a "jump start" for the new season
).
If it works while jumped at the battery, then the problem is between the horn and the battery. If the horn only "tries" to beep, I'd replace it.
Again, start at the horn button.