Dave
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It is hard to know what the stock horn button can handle. When a louder horn is installed....chances are that it uses more power than the stock horn, and that means more current will be passing through the wires and button contacts. This could potentially exceed what the stock wiring and button can handle.
When a relay is installed you will put less current through the stock wiring, and you most likely can get better performance from the new horn, as you will most likely be using a larger wire which will be able to handle the current blow better.
If the new horn only draws a bit more power....you might be OK without a relay. Does the stock horn list a power rating on it?
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