horn relay?

On earlier models the horns got direct battery voltage ( take off at the alternator ). The little black wire to the column switch only supplies a ground signal to close the relay contacts and that side is/was the only fused path. So IF the circuit that actually supplies power to the horn should short out it would blow the fusible link.
Another member says blowing his horn stalls the engine.
A relay click doesn't prove the contacts inside are good either.