Robbie 45 , what year / model ? The wiring looks "modern" so lets go with what I know. On the relay - Terminal S is wired to the Horn button. On a 1954 its 18 gauge Tan wire, attaches to a wire coming out of the steering column / horn button. The terminal B on the relay is wired to the B terminal on the voltage regulator using a 10 gauge Red wire. The H terminal on the relay is wired to the Horn (s) using a 12 gauge black wire. I've attached a photo of what it looks like on my 1954 3604 Truck and a wiring diagram for a 1954 Truck. Hope this helps.
Ron
Ron - - Dusty53 1954 Chevy 3604 In the Gallery Forum "You can't dance with the Devil and then wonder why you're still in Hell." "They will forget what you've said, and they will forget what you have done but they will never forget the way you made them feel."
