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Start by figuring out what's wrong with it. That's always the key. Always. Either the fault is in the power supply, the horn switch, or the horn itself.
What I would do is start by checking fuses and relays. If those checked out, I'd move to the horn itself (if it's readily accessible... I might save it for later if it isn't) and see if power is getting to the horn. If it is, I'd supply power and ground to the horn and see if it works.. if it did, then I'd know I had a faulty ground wire. If it didn't, I'd replace the horn. If that's not it, then I'd move to the horn switch itself... remove it from the steering wheel, check it for continuity. If it didn't have continuity, I'd replace the horn switch. If it did, I'd see if I had power going to it. If I didn't, then I'd know I had a wiring fault between the fuse panel and the horn switch. If I did, the most likely explanation would be a wiring fault between the horn switch and the horn itself. Or actually, between the relay and the horn itself, since I've already ruled out the relay.
What else can I help you with?
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