This manual pertains to the Caterpillar 320C hydraulic excavator, a robust machine engineered for heavy construction and earthmoving applications. Known for its reliability and efficient performance, the 320C is designed to meet the demanding requirements of various job sites. This document specifically focuses on the wiring and electrical schematics of the machine, providing detailed diagrams and information essential for understanding its complex electrical systems. The purpose of this English-language manual is to serve as a comprehensive resource for owners, technicians, and mechanics. It offers detailed wiring electrical schematics, enabling a thorough understanding of the excavator's electrical components and their interconnections. By consulting this guide, users can effectively diagnose issues, perform maintenance, and ensure the optimal operation and longevity of their Caterpillar 320C hydraulic excavator.