Dumb mistake - while I was replacing the body bushings, I pulled the convertible power wire out of the horn relay, near the radiator. I am 99% sure it attaches there.
However, I can't remember where on the relay it connects. My harness was abused by a previous owner so it is hard to tell. And, the convertible wiring is not on my wiring diagram schematic.
Any help or pics would be appreciated. Or it is trial and error this weekend.