Horn: Description and Operation

The horn system is powered by a 20 amp fuse located in the Power Distribution Center (PDC), cavity B, which is HOT at all times on circuit F31. This circuit supplies voltage to the coil and contact side of the horn relay

When the operator presses the horn switch, a ground path is completed on the coil side of the horn relay through the switch. The horn relay, located in the Power Distribution Center (PDC), then closes the relay contacts. Voltage is passed through the closed relay contacts on circuit X2 to the horns. Grounding for the horns is on the Z1 circuit.