Replaces OE Numbers and Compatibility - Fits most Mercury Outboard Motor Control Boxes. Replaces Mercury 87-17009A5, 87-17009A2; Sierra MP41070-2, MP41070-1, MP41070. Specification - Magneto-style ignition switch with push-to-choke in the start position. - 6 wires for push-to-choke and a 3-position Off-Run-Start. Key Benefits - Easy, reliable replacement for worn or damaged ignition switches on Mercury/Sierra systems. - Push-to-choke operation simplifies starting in conditions where choke helps performance. - Color-matched wiring to factory codes supports accurate, hassle-free installation. What’s Included and Installation - Includes two keys for convenience and security. - Plug-and-play installation: wires are color-coded to match factory color codes, allowing setup without additional wiring or adapters. Why this matters - Compatibility with common OEM parts reduces downtime and simplifies inventory for maintenance. - The magneto-style switch with push-to-choke provides a familiar, proven starting mechanism for Mercury outboards. - Three-position control (Off-Run-Start) gives clear, intuitive operation. Use scenarios - Replacing a faulty ignition switch on a Mercury outboard control box during routine maintenance on a small fishing boat. - Upgrading an older Mercury/Sierra setup to a magneto-style push-to-choke switch for easier cold starts on a weekend runabout. - Keeping a spare switch ready in a rental or charter boat fleet that uses Mercury-compatible control boxes, ensuring quick replacement without wiring changes.