The CUMMINS QSK38 CM850 MODULAR COMMON RAIL SYSTEM WIRING DIAGRAM Service Manual OEM is a comprehensive guide specifically designed for marine and generator equipment featuring the Cummins QSK38 model. This manual is a valuable resource for those looking to service or repair heavy equipment from brands such as Peterbilt, Cummins, Freightliner, Kenworth, and Multiquip. With detailed wiring diagrams and instructions, this service manual ensures that users have the necessary information to maintain or troubleshoot their equipment efficiently and effectively.