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Well, here's a question that could decide relay or not.
What's the current draw of the horn?
More importantly, how long do you expect to draw current, ie how long will you have the horn button depressed? Even if the current draw is close to the rated ampacity of the wiring, overheating will only occur if the current is drawn continuously for some period of time...short beeps, esp. intermittent beeps, will dramatically decrease the total power consumption.
FWIW, I've had this horn installed for a couple of years now without any evidence of problems due to excessive current draw.
'02 Blk/Slvr BA, Jireh fishtails, Freak, no AI, 160/42, 18T
She is the Beauty, I am the Beast.
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