429682 Mercury Ignition Plate | Genuine Used Part

🔧 Product Description

Genuine Mercury Mariner Three-Cylinder Ignition Component Mounting Plate - Part Number: 429682

A genuine used Mercury ignition plate for selected 75HP and 90HP three-cylinder two-stroke outboards.

The plate mounts electrical ignition components, terminal blocks and associated wiring in a fixed position on the powerhead. Mercury lists 429682 as an earlier ignition plate superseded through 42968T to complete plate assembly 42968A23. Used examples carry casting number 42874-C1.

⚙️ Key Features

• Genuine Mercury ignition-component plate

• Correct original reference 429682

• Casting number commonly marked 42874-C1

• Supports switch-box and electrical mounting hardware

• Later complete replacement assembly 42968A23

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 42968A23 → Supersedes 42968T

• 42968T → Replaces 429682

• 429682 original ignition-plate reference

OEM / Related Numbers:

• 429682

• 42968T

• 42968A23

• Casting: 42874-C1

• Switch-box assembly: 7778A12 on documented applications

• Terminal block: 45915

• Engine wiring harness: 41591A3

• Starter solenoid and battery-cable hardware vary by serial number

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

• Used original plates are commonly available under 429682 / 42968T

• Later OEM plate assembly 42968A23 is the functional Mercury replacement

🚤 Compatibility

Commonly used on:

• Mercury three-cylinder two-stroke ignition systems

• Mariner three-cylinder outboards

• Powerheads using the applicable switch-box electrical assembly

Typically suits:

• Mercury 75HP three-cylinder two-stroke

• Mercury 90HP three-cylinder two-stroke

• Mariner 75HP and 90HP equivalent models

• Mercury 90HP serial range 0C222000 through 0D283221

• Additional engines whose electrical-components diagram specifies 429682

• HP Range: Primarily 75HP - 90HP

• Engine Type: Inline three-cylinder carburetted two-stroke outboard

• Year Range: Late-1980s through early-1990s for documented serial ranges

🔌 Function

The plate keeps ignition and electrical components correctly spaced, grounded and protected from movement caused by engine vibration.

Common signs of failure:

• Plate is cracked around the mounting holes

• Electrical components move or vibrate

• Ground connections become unreliable

• Wiring rubs against the flywheel or engine block

• Corrosion damages the plate

• Switch-box mounting threads are stripped

• Plate is bent following electrical service

• Replacement components cannot be aligned correctly

📦 Condition

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated