How do you wire a 1948 desoto horn when there isn't no wires at all inside the horn?

To wire a 1948 DeSoto horn without any existing wires, first identify the horn's terminal connections, typically a positive and a ground. Connect one wire from the positive terminal of the horn to the battery's positive terminal, and then connect another wire from the horn's ground terminal to a clean metal surface on the vehicle for grounding. Finally, use a momentary switch to connect to the positive wire, allowing you to activate the horn when pressed. Ensure all connections are secure and insulated to prevent short circuits.