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

SKARUMMER's replacement boat ignition switch swaps directly into many Mercury/Mariner outboard control boxes to restore reliable starting and key control.

If your outboard won't start without wiggling the key, or the key feels loose and electrical systems behave intermittently, a worn or failed ignition switch is often the cause. This SKARUMMER replacement ignition starter switch is engineered to match the common Mercury 87-17009A2 / 87-17009A5 form-factor and wiring, offering a straightforward plug-and-play swap for compatible control boxes.

Will this replacement fit my Mercury or Mariner outboard control box?

Compatibility is designed around common OE reference numbers and connector arrangements. The switch replaces Mercury part numbers 87-17009A2 and 87-17009A5 and is compatible with many control box assemblies that use the same 3-position, 6-wire layout.

• Direct replacement for stated Mercury reference numbers.
• 3-position OFF–RUN–START configuration to match original operation.
• Six color-coded wires that correspond to factory color codes for simple connection.
• Recommended: verify your old switch’s wire count and part number before ordering.

How difficult is installation and what tools are required?

Installation is intended to be simple for anyone comfortable with basic marine electrical tasks. The SKARUMMER switch uses color-matched wires to align with factory harnesses, minimizing the need for splicing or modification in compatible setups.

• Plug-and-play design when your harness matches the six-wire connector.
• No special tools beyond simple hand tools if access is needed (screwdrivers, pliers).
• 100% tested before shipping to reduce troubleshooting time after installation.
• If wiring differs, consult a marine technician to avoid electrical damage.

What materials and features improve durability and performance?

This switch is built with high-performance polyester housing and brass contacts to balance corrosion resistance and conductivity in a marine environment. The mechanical design follows the three-position standard used by many Mercury control boxes.

• Polyester body resists damp conditions and mechanical wear.
• Brass internal contacts for reliable electrical conductivity and longevity.
• Two supplied keys for immediate use and spare key convenience.
• Meets or exceeds OEM standards and includes a 24-month warranty from SKARUMMER.

How can I tell when the switch needs replacing?

Signs that the ignition switch is failing include intermittent starting, a key that must be wiggled to engage, or electrical accessories that flicker when the key is turned. If diagnostics point to faulty switch continuity or visible wear on the key cylinder, replacement is a practical next step.

• Hard-to-turn or loose key action indicating worn tumblers.
• Boat starts only when key is held or jiggled—common sign of internal contact failure.
• Accessory power drops out when key remains in RUN position.
• Compare your current switch’s wiring and part number to the listed OE references before purchase.

Who is this for: This SKARUMMER ignition switch is ideal for boat owners, marine technicians, and DIYers who need a dependable, OEM-style replacement for compatible Mercury/Mariner outboard control boxes. Choose this replacement when you want a straightforward swap, two keys included, and a 24-month warranty for peace of mind. Always confirm fitment and wiring compatibility with your specific motor and control box model before installing.