Horn: Description and Operation
CIRCUIT OPERATIONThe horn system is powered by a 20 Amp fuse located in cavity 6 of the fuse block which is HOT at all times on circuit F31. This circuit supplies voltage to the coil and contact sides of the horn relay.
Power for the fuse is supplied on circuit A3. This circuit is protected by a fusible link located near the auxiliary jumper post on the left toe box.
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 relay bank, 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. Each horn has a separate grounding point. The left horn grounds at the left headlamp ground which is located on the left frame rail. The right horn grounds at the right headlamp ground which is located on the right frame rail.