Heavy-Truck Reference Library

Heavy-Truck Schematics & Parts References

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

Try a truck model, OEM number, sensor, relay or schematic.
Peterbilt switches and sensors

Switches & Sensors

Common Peterbilt switches, senders and sensors.

Peterbilt breakers and relays

Breakers & Relays

Heavy-truck circuit breakers, relays and electrical references.

Peterbilt special fittings

Special Fittings

Peterbilt air, hydraulic and suspension fittings.

CAT sensor reference

CAT Sensor PDF

Quick CAT engine sensor and part-number reference.

Popular Schematics

Peterbilt 320Model Family ElectricalP94-6028 · PDFPeterbilt 379Model Family ElectricalP94-6023 · 98 pages · PDFPeterbilt 387Model 387 SchematicsSK30218 · 59 pages · PDFCAT Engine WiringC10 / C12 / 3176B / 3406ESK24807 · 1 page · PDF
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