Dongfeng KR truck spare parts Roof harness assembly 3724040-C5111

Built as the central transmission hub for Dongfeng KR’s roof electrical systems, this harness features a precision-branched design optimized for diverse current demands. Conductors use 99.9% pure oxygen-free copper (OFC) with cross-sections graded from 0.5mm² (signal lines for GPS/telematics) to 4.0mm² (power lines for 24V roof AC units). This minimizes DC resistance to ≤0.008Ω/m for power branches, delivering 20A continuous current without overheating, while signal lines maintain ≤0.015Ω/m resistance for stable data transmission. Signal branches incorporate double-layer shielding (aluminum foil + tinned copper braid, coverage ≥96%) to block electromagnetic interference (EMI) from the engine and radio systems, ensuring GPS positioning accuracy within 3m and telematics data transmission error rates below 0.1%

Engineered for the exposed roof environment, the harness integrates multi-layer protections against sunlight, rain, dust, and temperature fluctuations. Each wire is insulated with heat-resistant cross-linked polyethylene (XLPE) that endures 130℃ continuous heat (from direct sun) and -45℃ cold (northeast China winters) without cracking. The outer sheath uses UV-stabilized, flame-retardant PVC (UL94 V-0 rating) with 1.5mm thickness, passing 3000-hour QUV UV aging tests with no brittleness. All connectors feature IP68 waterproofing (double Viton O-rings) and dust-tight seals, preventing water intrusion even during high-pressure car washes. Wire splices are sealed with adhesive-lined heat-shrink tubes, resisting corrosion from road salt and humidity—ensuring reliability in coastal, desert, and rainy regions

Designed to endure Dongfeng KR’s road vibrations and routine roof maintenance, the harness boasts robust structural durability. The main loom is bound with high-tensile nylon cable ties (tensile strength ≥600N) and reinforced with aramid fiber sleeves at stress points (branch junctions, connector bases) to prevent wire breakage. It withstands 500,000 vibration cycles (5-2000Hz, ISO 16750-3) without conductor fatigue. The 18-pin main connector features a positive-locking mechanism that resists dislodgment from cab vibration, with silver-plated contacts ensuring stable mating even after 100+ connect/disconnect cycles. Mounting clips are made of PA66+GF30 plastic, resisting impact from tools during maintenance and maintaining a secure hold on the roof panel under 10g shock loads

Optimized for fleet efficiency, the harness features a fully pre-assembled design that eliminates on-site wiring. All branches come pre-terminated with component-specific connectors (matching roof AC, warning lights, and antennas), while the 18-pin main connector plugs directly into the cab ECU. Fourteen pre-installed mounting clips align with the roof’s original holes, requiring only a cable tie gun and Phillips screwdriver for installation. Color-coded wires (red=power, black=ground, blue=signal) and clear branch labels (“AC MAIN”, “GPS ANT”, “WARNING LIGHT”) prevent connection errors. A single technician can complete replacement in 35 minutes—60% faster than non-pre-assembled harnesses. The design also includes 100mm service loops on key branches to accommodate minor roof component adjustments, reducing rework risks