Obvious one being the earth. Clean the earthing point up and try again.
If no different try running a wire from the + terminal on your battery to the + terminal on the horn if it works you have found your problem.
If it still just clicks, a standard 12V horn from a factors should be around a fiver. If the new one doesn't cure the problem, at least you are only a few quid out of pocket and now have a spare.
Then the fun begins tracing wires etc.
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