Heavy-Truck Schematics & Parts References

Quick access to Peterbilt wiring diagrams, engine schematics and commonly used parts references.

Switches & Sensors

Common Peterbilt switches, senders and sensors.

Breakers & Relays

Heavy-truck circuit breakers, relays and electrical references.

Special Fittings

Peterbilt air, hydraulic and suspension fittings.

CAT Sensor PDF

Quick CAT engine sensor and part-number reference.

Popular Schematics

Peterbilt 320
Peterbilt 379
Peterbilt 387
CAT Engine Wiring