Dongfeng KL left Combination switch assembly 3774020-C3300

Designed as a centralized control hub for critical vehicle functions, this combination switch integrates six core operating modules to simplify driver operations. It includes a 3-position headlight switch (off/low beam/high beam) with a push-pull dimmer function, a 2-position turn signal switch (left/right) with a self-canceling mechanism (activates after a 90° steering wheel turn), a windshield wiper switch (with 4 modes: off/intermittent/low speed/high speed) and a wiper washer trigger (press-to-spray), plus a fog light switch (on/off) and a hazard warning light trigger. Each switch features a clear, tactile detent design—providing distinct feedback to the driver (15-20N operating force) to prevent accidental activation, ensuring precise control even during bumpy driving on rough roads

Built to withstand the harsh operating conditions of heavy-duty trucks, the switch assembly’s housing is crafted from flame-retardant ABS plastic (UL94 V-0 rating) that resists high temperatures (operating temperature range: -40℃ to +85℃) and mechanical impact (able to withstand 50N static pressure without cracking). The internal contact points use silver-plated copper alloy (tensile strength ≥ 300MPa) to ensure low electrical resistance (≤ 50mΩ) and prevent oxidation—extending the switch’s service life to 100,000+ operating cycles (equivalent to 5-7 years of regular use). The connector is sealed with a nitrile rubber gasket, achieving an IP65 protection rating that blocks water, dust, and oil from entering the internal circuit—critical for preventing short circuits in humid or dusty environments (e.g., construction sites, mining areas)

Safety is prioritized in every aspect of this combination switch’s design. It incorporates a thermal overload protection circuit that automatically cuts off power to the switch if the current exceeds 10A (e.g., due to a shorted wiper motor), preventing overheating and fire risks. The turn signal and hazard warning functions comply with ECE R69 standards, with a built-in relay that ensures a stable flash frequency (60±5 times per minute) even when the truck’s electrical voltage fluctuates (9-32V). Additionally, the switch’s wiring uses automotive-grade PVC insulation (thickness 0.8mm) that resists oil, abrasion, and aging—preventing wire leakage or insulation cracking over time. These features ensure the switch operates reliably in all driving scenarios, reducing the risk of safety hazards caused by control failure

Installing this combination switch assembly is quick and straightforward, even for non-professional technicians. It mounts to the Dongfeng KL’s steering column via 2 pre-installed snap-in clips (no bolts required) and connects to the wiring harness with a single plug-in action—completing the installation in 15 minutes or less without the need for specialized tools. The product fully complies with China’s GB 15085-2013 “Motor Vehicle Turn Signal and Hazard Warning Signal Systems” and ISO 15031-6 (diagnostic compatibility), ensuring it meets global safety and quality requirements. Each unit undergoes 100% factory testing, including electrical continuity checks, mechanical durability tests, and environmental resistance tests (salt spray, high temperature, low temperature), guaranteeing consistent performance. It also comes with a 24-month warranty, covering defects in materials or workmanship for added peace of mind