31510-ZV1-810 Lamp (12V/20W) Coil - Overview. The 31510-ZV1-810 Lamp (12V/20W) Coil is a critical component of Honda marine engine systems. Specifically designed for lighting purposes, this 12-volt, 20-watt coil lamp supports the electrical system by providing reliable illumination for operational indicators and instrumentation. Engineered to exacting factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. High-q