Overview – HARNESS, WIRING A 4063105
For Cummins NH and NT 855 industrial engines, the Cummins HARNESS, WIRING A 4063105 provides the correct fit and performance expected from a genuine-spec replacement.
Parts Characteristics
A pre-assembled engine wiring harness, loomed and labelled for the 855 industrial build. Cross-linked insulation, sealed multi-pin connectors and protective conduit carry sensor and actuator circuits around the engine, replacing point-to-point wiring that ages badly in heat and vibration.
Applicable Models & Applications
Applies to NH/NT 855 industrial engines in pumps, compressors, drilling and construction machinery. Compare the connector count and branch layout against your old harness before ordering – the 855 family ran several harness variants depending on instrumentation and start systems.
Maintenance & Replacement
Inspect the harness visually at every service: follow it from connector to connector looking for chafe points at brackets and clamps, melted insulation near the exhaust side, and connectors hanging on their wires. Re-secure any section that has shed its clips, because a harness that rattles on the block chafes through within months.
Chase intermittent gauge readings, dead sensors or sporadic start failures with a wiggle test before replacing components. Move the harness gently section by section while watching the reading – a fault that appears and disappears with movement is almost always a broken conductor or corroded pin inside an otherwise clean-looking connector.
To replace the harness, disconnect both battery terminals first, photograph every connector and clip position, then release the old harness from its clamps and route the new one along the same path. Keep it clear of exhaust components and moving drives, seat every connector fully with a fresh seal, and apply dielectric grease to exposed contacts before locking the covers.
Never repair a damaged harness with twisted tape joints in the engine bay – vibration and heat defeat them quickly. Repair properly with the correct terminals and adhesive-lined shrink sleeve, or replace the harness outright; on an 855 the harness cost is small against the downtime a marginal repair costs.
Price Reference (USD)
For planning purposes, allocate USD 150 to USD 500 per HARNESS, WIRING A 4063105, excluding local import duties.
Value & Service
We supply brand-new, correctly loomed harnesses, cross-check the connector layout against your engine’s build, and ship coiled and boxed so it arrives ready to route.
Racer Machinery maintains a deep inventory of Cummins Electrical Parts, and the HARNESS, WIRING A 4063105 is available with same-week dispatch for urgent repairs.
