How do I fix my horn on '72 GMC Pick-up?

Question

Tested horn by hooking wire to it and touching other end of wire to posi. post on battery. Horn worked. When I push horn button on steering wheel, I can hear a clicking sound under dash, but that is all. Is there a horn relay under dash, and if so, where exactly is it, and what does it look like?

Thank-you!!

Found relay inside under dash on firewall, just to the left of steering column.

Answer 1

Usually they were bolted to the voltage regulator next to the radiator. It's a little retangular metal box with 3 wires going to it.
Place your head under the dash & press the horn to locate the clicking.

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