Car wiring diagrams: 6 Volt Car Horn Wiring Diagram, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. Volt horn relay. . How to Test a , Pin Relay With or Without a Diagram Duration .Older model cars and some scooters have a six volt power supply for the horn. If you want to install Disconnect the negative terminal from the car s battery. Consult your owner s manual to understand where the horn relay is located. You may .Need a volt wiring diagram for aooga horn to replace existing hornh run volts because my car is not stock, I can get a volt battery very .