Dongfeng KL truck spare parts Light knob switch assembly 3750025-C3301

Built as the core control interface for the truck’s lighting system, this assembly features an ergonomically optimized knob design for driver convenience. The knob (diameter 45mm) is wrapped in oil-resistant TPE rubber with anti-slip texture, fitting securely in drivers’ gloved hands—critical for operation in cold or rainy conditions. It offers 5 precise gear positions (Off-Position Lights-Low Beam-High Beam-Fog Lights) with clear tactile detents, requiring a torque of 1.2-1.5N·m to switch gears, preventing accidental activation. A built-in LED indicator (red for high beam, green for position lights) provides visual feedback, ensuring drivers can confirm light status without glancing away from the road. The 15° tilted installation angle aligns with the Dongfeng KL’s dashboard contour, reducing driver arm fatigue during frequent adjustments

Engineered to withstand repeated daily operations and cab vibrations, the 3750025-C3301 assembly features a rugged internal structure. The switch core uses silver-plated copper contacts (conductivity ≥98% IACS) with a contact pressure of 3-5N, ensuring stable current transmission and resisting arc erosion—enduring 100,000+ switching cycles (equivalent to 500,000km of typical use) without contact failure. The knob’s rotating shaft is made of 45# carbon steel (heat-treated to HRC 35) with a self-lubricating POM bushing, reducing rotational friction and ensuring smooth operation over time. The outer housing is made of flame-retardant ABS plastic (UL94 V-0 grade) with reinforced ribs, resisting impact and deformation from accidental knocks or dashboard vibrations (10-500Hz)

Optimized to ensure the safety of the truck’s lighting system, the switch assembly integrates multiple protective functions. A built-in thermal fuse (rated current 20A) automatically cuts off the circuit when current exceeds the safe range, preventing wire overheating and fire risks caused by short circuits (e.g., water ingress in headlight wiring). The 16-pin connector uses IP67-rated HNBR rubber seals, blocking water and dust from entering the electrical interface—passing 1000-hour neutral salt spray testing (ASTM B117) with no corrosion. The switch’s gear positioning mechanism features a fail-safe design: if the knob is accidentally knocked, it remains in the current gear instead of jumping to “Off,” avoiding sudden light failure during night driving

This light knob switch assembly is designed for efficient installation and long-term cost savings for Dongfeng KL operators. Its modular structure allows a single technician to complete replacement in 30 minutes using standard screwdrivers—no specialized tools required. The OE-compatible design ensures perfect signal matching with the lighting control module, avoiding the flickering lights or incorrect gear response common with aftermarket switches (repair costs for such issues up to $400). The high-durability components extend the switch’s service life to ≥300,000km—three times that of non-OE alternatives—reducing replacement frequency. By ensuring reliable lighting control, it helps avoid traffic violations (fines up to $200 for improper light use) and improves driving safety. Backed by a 1-year/150,000km Dongfeng warranty, it provides predictable maintenance expenses for fleet operations