SKARUMMER Boat Ignition Switch for Mercury/Mariner — 3-Position 6-Wire with 2 Keys (87-17009A2/A5)

The SKARUMMER Boat Ignition Switch is a direct-fit replacement for many Mercury/Mariner outboard control boxes, delivering a 3-position key switch (OFF–RUN–START), six-wire connection, and two keys for a plug-and-play swap.

If your outboard stalls, requires excessive key wiggling, or fails to crank, a worn ignition switch is a likely culprit. This SKARUMMER replacement mirrors the original equipment form and function for Mercury part numbers 87-17009A2 and 87-17009A5 and compatible Sierra MP41070 series control boxes. Built with durable polyester housing and brass contacts, it’s designed to give reliable electrical connectivity and straightforward installation to get your boat back on the water quickly.

How does this replacement ignition switch restore starting reliability?

Electrical wear or corroded contacts in the original switch can interrupt power to the starter and accessories. This SKARUMMER unit uses quality brass terminals and a tested polyester body to re-establish solid connections, reducing intermittent starts and key resistance.

• Brass contact points for better conductivity and corrosion resistance
• Three positions: OFF, RUN, START for standard outboard control
• Comes with two cut-to-fit keys so you can secure and operate the boat
• 100% function-tested before shipment to ensure reliable performance

Will it fit my Mercury or Mariner control box?

SKARUMMER designed this switch to replace common OEM ignition switches used on many Mercury and Mariner outboards. It lists OE cross-references and fits Sierra MP41070-series components, but fitment should be verified against your control box model before ordering.

• Direct replacement for Mercury 87-17009A2 and 87-17009A5 references
• Compatible with Sierra MP41070-1 and MP41070-2 in many installations
• Wire colors match factory coding for easier wiring confirmation
• Check your control box part number and wiring diagram before purchase

How easy is installation for a DIYer or marine technician?

Installation is intended to be straightforward: the wiring harness uses six wires with factory-matching colors to simplify reconnection. No splicing is required in most cases, making it a plug-and-play swap for anyone comfortable with basic boat electrical work.

• Six-wire connector matches factory color codes for push-to-choke and ignition
• Plug-and-play replacement—no permanent wire cutting in typical installs
• Mounts into existing control box openings using OEM-style dimensions
• Includes two keys to replace lost or worn originals

What build quality and warranty support does SKARUMMER provide?

SKARUMMER uses materials chosen for marine environments—high-performance polyester for the housing and brass for electrical contacts—aiming for durability and dependable conductivity. Each switch is tested before shipping and backed by a 24-month warranty to protect against defects.

• Durable polyester housing resists moisture and mechanical wear
• High-quality brass terminals for consistent electrical contact
• 100% tested units and 24-month manufacturer warranty
• Customer support available directly from SKARUMMER for fit or function questions

Who is this for? Boaters, marine technicians, and DIYers who own Mercury or Mariner outboards and need a reliable, OEM-style ignition switch replacement will find this SKARUMMER unit suitable. It’s particularly useful if your current ignition shows intermittent starting issues, loose-key operation, or visible wear. Always confirm compatibility with your control box model and wiring diagram before purchase to ensure a proper fit and safe installation.