jinyi Boat Ignition Switch for Mercury Outboards (Fits 87-88107A8/A5) — Pre-wired 6‑Lead, Two Keys, Sealed Base

If your Mercury outboard is showing intermittent cranking, hard-to-turn keys, or won’t start, this jinyi ignition switch (fits Mercury numbers 87-88107A8, 87-88107A5, 87-88107, 7-1155) is built to be a straightforward, long-lasting replacement. Designed for Mercury outboards from 1994 onward that use a side-mount control box, the unit is pre-wired with six leads for Push-to-Choke setups and comes with two keys and a sealed base for marine conditions.

How does this switch match OEM fit and wiring?

The jinyi switch mirrors the original Mercury form, function and connector layout so it installs without cutting or splicing. Its 6-wire harness recreates the factory Push-to-Choke circuitry and three-position key action (Off, Ignition, Start) for correct engine behavior.

• Direct-fit replacement for Mercury part numbers listed: no modification needed.
• Pre-wired six-conductor harness for simple plug-and-play installation.
• Three-position operation to maintain original control logic.
• Includes two identical keys to replace lost or worn originals.

What materials and protection keep it working in saltwater?

Built with marine-aware materials, the switch uses high-performance polyester housing and brass contacts to resist corrosion and maintain conductivity in salty, wet environments. A potted wire base seals the internals against moisture and vibration common on boats.

• Polyester housing resists UV and salt exposure.
• Brass electrical contacts for reliable conductivity and low wear.
• Potted base provides waterproofing and shock resistance.
• Durability focused on typical marine stresses: spray, vibration, and temperature swings.

Will this stop common ignition problems like sticky keys and no-starts?

This replacement addresses typical ignition failures caused by worn internal switch contacts or corroded terminals. Replacing a failing switch with this unit often restores smooth key rotation and dependable starter engagement without further electrical troubleshooting.

• Resolving sticky or loose key action by replacing worn switch internals.
• Restoring starter engagement when switch contacts have failed.
• Pre-wired harness minimizes installation errors that can cause starting faults.
• Tested to meet OEM-style performance for consistent starting cycles.

How easy is installation for a DIYer or technician?

The product is engineered for quick replacement: unplug the old switch, bolt in the new unit, and connect the pre-wired harness. No soldering or wire splicing is required, allowing a fast return to service and less time in the workshop.

• Plug-and-play pre-wired harness eliminates splicing.
• Standard mounting and key sizing match OEM fixtures.
• Comes with two keys so you get immediate spares.
• Technical support available for fitment or installation questions.

Who this is for: boat owners, marine technicians and DIYers with Mercury outboards (1994 and newer) using side-mount controls who need a reliable, OEM-style ignition switch replacement. If you want a corrosion-resistant, pre-wired unit that restores normal Off–Ignition–Start operation without rewiring, this jinyi switch is optimized for a quick, professional-feeling repair and ongoing marine use.