Fuse/Relay/Circuit Breaker Identification (front-engine diesel chassis)

Circuit breakers protect against circuit overload. If a circuit becomes overloaded (usually caused by a short to ground), the circuit breaker opens, stopping current flow. The vehicle may be equipped with auto-reset breakers.

The electrical system has five separate power distribution modules (PDMs) containing both fuses and relays. An optional tow power PDM is also available. See Fig. and see Fig.. The PDMs are mounted in two places:

• Two inside the cab area, typically at the base of the steering column.

• Three outside, typically mounted to the right of the operator's station.