Description
Mercury Harness Assembly, Key Switch, 20 Ft w/ Warning Horn (816626A20 / 84-816626A20)
The Mercury 816626A20 Harness Assembly is a complete engine-to-helm rigging harness that includes a key switch and a warning horn, making it a convenient all-in-one solution for replacing or upgrading older ignition/harness setups. With a 20-foot length, it provides the reach needed for many common boat layouts while keeping the installation clean and OEM-correct.
This assembly is commonly listed as fitting a wide range of Mercury and Mariner outboards (including many 2-stroke and 4-stroke applications), plus select Force outboards and Mercury Jet Drives. It’s a solid choice when you want one part that covers the harness run, ignition switch, and the audible warning horn connection in a single kit.
Applications
- Engine-to-helm harness replacement with integrated key switch and warning horn
- Fits many Mercury/Mariner outboards (varies by engine and origin)
- Fits Force 2-cycle 40 hp and higher (1993 and newer)
- Fits Mercury Jet Drives (application dependent)
Shipping & Returns
Orders ship via UPS or USPS depending on package size and destination. Returns are handled per our policy: /policies/refund-policy.
Key Facts
- Brand: Mercury / Quicksilver
- Part Number: 816626A20 (also shown as 84-816626A20)
- Supersedes: 84-17925A20
- Harness Length: 20 ft
- Includes: Key switch + warning horn
- Common Fitment Notes: Often listed for Mercury/Mariner 2-cycle 6 hp+ (USA/Belgium origin), Mariner 30/40 hp oil injection (varies by origin), Mercury/Mariner 4-stroke (varies), Force 40 hp+ (1993+), and Mercury Jet Drives
- Adapter Note: When used with MY2005+ 8/9.9 hp four-stroke outboards, an adapter harness 892473A01 is commonly required
What’s Included
- Harness Assembly: 20 ft engine-to-helm harness
- Ignition Switch: Key switch (installed/attached as part of the assembly)
- Alarm: Warning horn
Service Notes
- Fitment depends on your engine family, year, and harness/connector style. Match your existing harness part number or verify by engine serial/model before ordering.
- If your engine requires an adapter harness (commonly 892473A01 for certain MY2005+ 8/9.9 hp four-strokes), plan to source that separately.
- Route the harness away from sharp edges, pinch points, and heat sources; secure it with proper clamps/ties to prevent chafe.