Dongfeng KL truck parts Left roof harness assembly 3724048-C3902

Built as the central connection hub for left roof electrical devices, this harness features a structured wiring design to guarantee stable signal transmission and efficient power distribution. It uses high-purity oxygen-free copper (OFC) conductors with cross-sectional areas ranging from 0.3mm² (sensor signals) to 3.0mm² (air conditioner power), achieving conductivity ≥98% IACS and voltage drop ≤0.05V/m. Signal wires for the sunroof position sensor are twisted in pairs (twist pitch 18mm) and shielded with tinned copper braid, reducing electromagnetic interference (EMI) by 70% to prevent sunroof jamming or incorrect positioning. Power circuits for high-consumption devices (e.g., air conditioner controller) integrate 20A fuses, while dedicated ground wires ensure balanced current flow, avoiding voltage fluctuations that disrupt sensitive electronics like the dome light dimmer

Engineered for the compact space of the Dongfeng KL’s roof interior, the 3724048-C3902 harness features a lightweight, low-profile design without compromising durability. The main harness has a diameter of only 18mm, allowing it to be routed through narrow gaps between the roof lining and metal frame. It uses thin-walled but high-strength TPE (thermoplastic elastomer) insulation—reducing overall weight by 15% compared to standard PVC-insulated harnesses—while maintaining tensile strength of 15MPa. The branch design is optimized to minimize wire length: each sub-harness to roof components (e.g., dome light, sunroof) is pre-cut to exact dimensions, eliminating redundant wiring and avoiding interference with the roof’s insulation or trim panels. Reinforced mounting clips (nylon 66) secure the harness at 300mm intervals, keeping it neat and preventing movement during vehicle vibration

Optimized to endure the unique environment of the truck roof—exposed to direct sunlight, temperature extremes, and occasional water ingress (e.g., sunroof drainage)—the harness integrates comprehensive protective measures. The main body is wrapped in a UV-stabilized polyester braid (density 20×20 strands/cm²) that resists sun-induced degradation, maintaining structural integrity even after 3,000 hours of direct sunlight exposure. All connectors are IP66-rated, with silicone rubber seals that block water and dust, while terminals are tin-plated (5μm thickness) to resist corrosion from condensation. The TPE insulation operates stably in temperatures from -40℃ to 130℃, avoiding melting in hot roof environments or cracking in cold weather. A dedicated drainage channel in the harness routing prevents water pooling around connectors, further enhancing reliability

This left roof harness assembly is designed for efficient installation and long-term cost savings for Dongfeng KL operators. Pre-assembled connectors, color-coded wires, and clear labels (e.g., “Sunroof Motor,” “Dome Light”) allow a two-person team to complete replacement in 1.5 hours—50% faster than custom-wired solutions. The OE-compatible design ensures seamless integration with the BCM, avoiding the electrical malfunctions (e.g., non-functional sunroof, flickering lights) of aftermarket harnesses that cost $500+ to repair. The high-durability materials extend service life to ≥300,000km—three times that of non-OE alternatives—reducing replacement frequency. By ensuring reliable operation of roof comfort features (e.g., air conditioner, sunroof), it improves driver satisfaction and retention. Backed by a 2-year/200,000km Dongfeng warranty, it provides predictable maintenance expenses and maximizes fleet uptime