855746A2 Mercury Trigger | Genuine Used Part

🔧 Product Description

Genuine Used Mercury Mariner Four-Cylinder CDM Short-Arm Trigger - Part Number: 855746A2

A genuine pre-owned Mercury and Mariner five-wire trigger assembly for selected four-cylinder 80 Jet, 100HP, 115HP and 125HP two-stroke engines.

This short-arm timer-base trigger supplies crankshaft-position information to the CDM ignition system and rotates with the spark-advance linkage.

⚙️ Key Features

• Genuine Mercury or Mariner used trigger

• Correct OEM reference 855746A2

• Four-cylinder CDM ignition configuration

• Five-wire short-arm assembly

• Suitable for selected 80 Jet and 100HP through 125HP engines

• CDI and Sierra replacements available

🔄 Supersession & Cross Reference

OEM Supersession / Related Chain:

• 834821T - Earlier or related trigger

• 854513T - Related service trigger

• 855746A2 - OEM assembly reference

• 855746A21 - Related service-kit reference

• 855748A2 - Related OEM trigger reference

OEM / Related Numbers:

• 855746A2

• 855746A21

• 855748A2

• 854513T

• 834821T

• Trigger Type: Four-Cylinder CDM Short Arm

• Wiring: Five-wire configuration

Aftermarket / Verified Equivalents:

• CDI Electronics: 134-4513-4

• Sierra: 18-99415

• Aftermarket replacement for 834821T / 854513T

• Aftermarket trigger replacing 855746A2 / 855748A2

🚤 Compatibility

Commonly used on selected:

• Mercury 80 Jet

• Mercury 100HP

• Mercury 115HP

• Mercury 125HP

• Compatible Mariner four-cylinder engines

Representative fitment:

• 80 Jet from applicable 0G-series serial ranges

• 100HP through 125HP from applicable 0G760300-and-later ranges

• Representative production period: Approximately 1996-2006

Important fitment note:

• Confirm the engine is a four-cylinder CDM model.

• Compare the five-wire connector and short advance arm.

• It is not interchangeable with three-cylinder trigger 855746A1.

• Serial-number verification is essential.

🔌 Function

The trigger sends timed crankshaft-position pulses to the CDM ignition modules.

Rotation of the trigger assembly changes ignition advance according to throttle position.

Common signs of failure:

• No spark on one or more cylinders

• Intermittent spark loss

• Difficult starting

• Engine stalls when warm

• Misfire under load

• Engine will not reach rated rpm

• Timing does not advance correctly

• Trigger wiring rubs under the flywheel

• Electrical output is outside specification

Recommended checks before installation:

• Confirm all five wires and terminals

• Check the short-arm configuration

• Test trigger resistance and output

• Inspect CDM modules and stator

• Check flywheel magnets and key

• Confirm smooth timing-arm movement

• Set maximum timing after installation

📦 Condition

• Genuine Mercury or Mariner used part

• Pre-owned electrical component

• Wire ageing and cosmetic wear may be present

• Electrical testing before installation is strongly recommended

• Supplied in protective or equivalent packaging