The Baldwin's Performance CM849 In-Cab Standalone Harness is the ultimate solution for 5.9 Cummins builds running the CM849 ECM in a standalone configuration with the ECM relocated inside the cab. Combining the clean wiring of a standalone build with the heat protection and security of an in-cab ECM location, this harness is the go-to choice for serious competition builds, engine swaps, and dedicated performance trucks where both ECM protection and simplified wiring are priorities.

A standalone harness eliminates all factory body, chassis, and accessory wiring not required to run the engine — giving you a clean, purpose-built starting point. Moving the ECM inside the cab removes it from the harsh under-hood environment entirely, protecting it from heat, vibration, oil, and moisture that can degrade ECM performance and longevity over time.

Every harness is built with the highest quality materials available — a premium OEM-grade build designed to outlast factory wiring in every measurable way. Construction starts with all new OEM connectors and terminals paired with TXL automotive wire featuring chemically cross-linked polyethylene insulation engineered for high heat environments. The harness is flame resistant, moisture resistant, oil resistant, gasoline resistant, diesel resistant, grease resistant, and resistant to most solvents and acids.

From there every harness is fully wrapped in Tessa tape for an additional layer of protection against cuts, abrasions, and environmental hazards. Over that is a full loom of 10 mil PET semi-rigid split braided loom for structural protection and a clean professional appearance. Finally each harness is finished with dual wall heat shrink at all termination points to lock out moisture and ensure long-term reliability.

The result is the most capable CM849 harness in the Baldwin's lineup — standalone wiring with in-cab ECM relocation for maximum build flexibility, ECM protection, and long-term reliability.