This side marker lamp assembly is the side outline lighting component for FAW heavy trucks. It marks the vehicle width and outline to remind surrounding vehicles of the truck body size during night or low-visibility driving. The lamp housing is made of high-strength anti-aging material with good waterproof and dustproof performance, adapting to long-haul heavy-duty and all-weather working conditions. Precision mold manufacturing ensures the lamp matches original mounting holes and wiring connectors perfectly. Each lamp undergoes lighting performance, waterproof and aging tests before delivery. It is an essential replacement spare part for truck side lighting system maintenance.