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 Mercury lists 429682 as an earlier ignition plate superseded through 42968T to complete plate assembly 42968A23.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

🚤 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

🔄 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

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated