35100-ZW4-H02 Combination Switch - Overview. The 35100-ZW4-H02 Combination Switch is a vital component of Honda marine engine systems. It serves as the central control unit integrating ignition, starting, and trim/tilt functions within a single lever assembly, ensuring intuitive operation of your engine. Designed specifically for Honda outboards, this switch supports the electrical system by managing multiple controls in one compact, user-friendly unit. Due to its precise engineering, it ensures