Dongfeng KL truck parts Left sleeper reading light harness assembly 3724140-C3301

Built as the power core for the left sleeper reading light, this harness delivers stable low-voltage current to guarantee consistent, flicker-free illumination. It uses high-purity oxygen-free copper (OFC) conductors with a 0.75mm² cross-sectional area, achieving conductivity ≥98% IACS and voltage drop ≤0.03V/m—ensuring the reading light receives steady 12V power even when the truck’s electrical system is under load (e.g., air conditioner running). The harness integrates a dedicated current-limiting resistor (10Ω) that prevents overload, protecting the LED reading light (10-15W) from burnout caused by voltage spikes. A twisted-pair wiring design (twist pitch 25mm) reduces electromagnetic interference (EMI) from the truck’s communication systems, avoiding light flickering that strains drivers’ eyes during rest or document reading

Engineered for the compact space of the Dongfeng KL’s sleeper compartment, the 3724140-C3301 harness features a flexible, low-profile structure. The main harness has a diameter of only 8mm, allowing it to be routed through narrow gaps between the sleeper wall insulation and decorative panels without bulging or affecting interior aesthetics. Wires are insulated with soft thermoplastic elastomer (TPE) material that bends easily (minimum bending radius 15mm) and remains pliable in temperatures from -40℃ to 100℃, avoiding brittleness in cold sleepers. Pre-cut branch wires (400mm length for the dimmer switch) eliminate redundant wiring, while miniaturized connectors (16mm width) fit into the tight spaces behind the reading light fixture, simplifying installation and reducing the risk of wire tangling

Optimized to withstand the unique conditions of truck sleepers—exposed to occasional spills, dust, and driver contact—the harness integrates reliable protective measures. The main body is wrapped in a wear-resistant nylon mesh sleeve (density 16×16 strands/cm²) that resists scratches from luggage or cleaning tools, extending the harness’s service life by 40% compared to unprotected alternatives. All connectors are IP65-rated, with HNBR rubber seals that block water and dust ingress—preventing short circuits from accidental beverage spills (a common sleeper hazard). Terminals are tin-plated (5μm thickness) and feature a locking design to ensure secure contact, even during cab vibration (10-300Hz). The TPE insulation resists diesel fuel, cleaning agents, and sweat, maintaining electrical integrity in daily use

This left sleeper reading light harness is designed for efficient maintenance and long-term cost savings for Dongfeng KL operators. Pre-assembled connectors, color-coded wires (red for positive, black for negative), and adhesive-backed mounting clips allow a single technician to complete replacement in 30 minutes—70% faster than custom-wired solutions. The OE-compatible design ensures seamless integration with the BCM, avoiding the dimmer switch malfunctions or light failure common with aftermarket harnesses (repair costs up to $200). The stable power supply extends the reading light’s service life by 30%, reducing replacement frequency. By ensuring reliable, flicker-free illumination, it improves driver rest quality—critical for long-haul safety—and enhances driver satisfaction. Backed by a 1-year/150,000km Dongfeng warranty, it provides predictable maintenance expenses and supports fleet driver retention efforts