Just as an FYI: I got my horn up and running
I first ran power to both horns directly from the battery & confirmed they work: I have two bumps on my head to prove it!
I then swapped out the fuses [both inside the car as well as on the firewall]: still nogo
Finally, not looking forward to having to take the steering wheel off, I went out & bought a relay, swapped it for the one on the firewall & SUCCESS!
Not only do I have a horn & can pass NY State Inspection, but they both now work as opposed to just one: what sweet music for my ears!