Do you also have a single horn on the manifold? The horn button is the ground to the circuit. The button was likely put on the steering mast because the internal wire was grounding and making the horn honk at inappropriate times.

@tiny The mechanic rewired the car and pretty much removed everything, so I have nothing to go by. Previous owner painted everything under the hood black, a really smart move. I think he took the horns under the hood off. I'll check, car is stored out of town and I've been sitting tight due to rains and a few other factors. Mechanic also has my shop manual, which I'm going to have to physically retrieve.

This photo shows the accessory horns off of my 38 before restoration. It shows the relay. The center lug goes to the battery. You can see the horns connected. The lug not connected goes to the horn button if memory serves me correctly. You can test that by running a jumper from that lug to ground, the horns should honk.