It sounds like the horn relay is operating but the horn is not getting any power to it. Check where the wiring is attached to the horn contacts for tightness and security. You could test the horn itself by running a jumper wire direct from the battery to the horn contact. If no noise replace horn unit. If jumper wire works, then the relay should be replaced. .
Sounds like the horn relay is clicking, trying to send current to the horn, but the horn is probably no good, burned out. Test the horn with direct current to see if it's good or bad.
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