Re: Horn Relay 1967 Camaro Coupe
Al's pic above is how mine is wired which I tried to explain but didn't have a pic :-)
When I got my car the horn didn't work and I started by testing and disconnecting the wires going into relay and inadvertently connected the small green & black wires backwards which, like you, the relay got hot so I swapped them back, as in Al's pic, and no more hot relay
I assume now your wiring mirrors what is in Al's pic now.
IDK what the test procedure would be for the relay itself....to confirm your "new" relay is good.
assuming your horns did work before the relay swap, test the horns themselves before the horn button/wheel
"My" horn problem was the spring that connects the green (the spring that drops in the hole under horn ring) wire to the circular ring inside the steering wheel hub was missing but otherwise the horn, steering wheel (Grant) were installed correctly by PO. I took a spring from a ball point pen I had and it was a perfect fit. Horn works perfect no