68 Firebird Convertible wiring

[GM3CAR]

Finally just signed up today after reading posts for awhile. I'm in the process of getting my 68 Bird road ready and have a question about the convertible top wiring. Most wiring diagrams are not specific as to where the firewall circuit breaker receives its power. One terminal has the orange/blk wire going through firewall to fuse box. Schematics show other terminal gets power from horn relay. Which plug/terminal on horn relay goes to circuit breaker? Any help would be appreciated.