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If you can get a voltage source to the horns, make sure the horn itself is working. The clicking "usually" means the relay is working (I've had one instance where it wasn't), but that should also save a lot of work in that you know there isn't a break somewhere between the column and the relay. I'd see if you can get at the horn leads with a multimeter and see if you're getting any power when its pressed. If you dont want to go through the hassle of trying to trace the horn wires back, it may be worthwhile to just clip the wires at the relay, buy a regular relay for $1 and run some new wires for it.
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