jinyi Mercury Outboard Ignition Switch — Pre-wired 6-Wire, Fits 87-88107A8/A5 with 2 Keys

jinyi's replacement ignition switch (fits Mercury 87-88107A8, 87-88107A5, 87-88107/7-1155) is a pre-wired, 3-position marine starter switch with two keys that restores reliable Off–Ignition–Start control for side-mount Mercury outboard control boxes.

When an ignition switch fails on a Mercury outboard, the boat won’t start, the key can stick, or electrical accessories behave erratically. This jinyi unit is built as a direct-fit substitute for common Mercury part numbers and model years from 1994 onward that use side mount control boxes. It combines corrosion-resistant materials, a molded waterproof base, and a six-wire harness to match Push-to-Choke wiring schemes so you can replace the old switch quickly without cutting or repinning factory wiring.

What makes this jinyi ignition switch compatible with my Mercury outboard?

The switch is designed to match the electrical layout and mounting of Mercury part numbers 87-88107A8, 87-88107A5, 87-88107, and 7-1155, so it integrates with many models from 1994 and later that use side-mount control boxes. It uses a 6-wire configuration to support Off, Ignition, and Start positions including Push-to-Choke setups.

• Direct-fit replacement for the listed Mercury part numbers.
• Pre-wired harness avoids cutting or splicing factory cables.
• Three-position Faceplate: Off → Ignition → Start functionality.
• Designed for side-mount control box installations.

How does the six-wire design improve starting and controls?

The optimized 6-wire layout separates starter, ignition, choke, and accessory circuits to mirror OE wiring and reduce misfires or hard-to-turn keys. That clear wiring separation improves reliability and keeps the starter motor and ignition system operating independently while maintaining Push-to-Choke behavior.

• Dedicated starter and ignition leads for consistent starts.
• Push-to-Choke compatibility for carbureted engines and choke circuits.
• Accessory circuit wiring preserved for gauges and electronics.
• Pre-potted base protects the wire junction from moisture and vibration.

Why is this switch suitable for marine use and harsh conditions?

This switch uses marine-grade components — high-performance polyester housing and brass contacts — plus a potted, sealed wire base to resist salt spray, moisture, and vibration common in boating environments. Those features help prevent corrosion and electrical failure so the switch lasts longer in saltwater and freshwater conditions.

• Corrosion-resistant brass contacts for reliable conductivity.
• Durable polyester housing resists UV and wear.
• Potted, waterproof wire base reduces water intrusion risk.
• Shockproof design tolerates marine vibrations and impacts.

How easy is installation and what comes in the box?

Installation is straightforward: the switch is a plug-and-play direct replacement with a pre-wired harness that fits the same mounting footprint as the OEM unit, so no splicing or special tools are usually required. The package includes two keys and clear fitment guidance so you can return your boat to service quickly.

• Comes with two machined keys for immediate use.
• Pre-wired harness for fast, no-splice installation.
• Matches OEM mounting pattern—bolt-in replacement.
• Technical support team available for fitment questions.

Who is this for? If you own a Mercury outboard (1994 or newer) that uses a side-mount control box and you’re seeing ignition problems, sticking keys, or starting failures, this jinyi ignition switch is built to be a practical, OEM-quality replacement. It’s aimed at DIY boat owners, marine mechanics, and service shops who want a reliable, marine-rated switch with simple installation and the correct wiring configuration for Push-to-Choke systems. For any uncertainty about fitment, consult your control box part numbers and our support team to confirm compatibility before purchase.