# 858404T4 Mercury Stator | Genuine Used Part

🔧 Product Description

  

Genuine Mercury / Mariner 40 Amp V6 Stator Assembly - Part Number: 858404T4

  

A genuine Mercury / Mariner 40 amp stator assembly used on V6 2.5L outboards and SportJet applications. This stator supplies ignition and charging output on 135HP, 140HP, 150HP, 175HP, 200HP and 240HP Mercury engines with CDM-style ignition systems.

  

⚙️ Key Features

  

• Genuine Mercury / Mariner stator assembly

• Correct Mercury part number 858404T4

• Also formatted as 398-858404T4

• 40 amp 6-cylinder stator family

• Used on 2.5L V6 and SportJet charging / ignition systems

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 398-858404T4 later Mercury 40 amp stator service format

• 398-858404T3 earlier related Mercury stator reference

• 858404T4 Mercury stator assembly reference

  

OEM / Related Numbers:

  

• 858404T4

• 858404T 4

• 398-858404T4

• 398858404T4

• 398-858404T3

• 398858404T3

  

Aftermarket / Verified Equivalents:

  

• CDI Electronics: 174-0002

• WSM: 363-8404

• Aftermarket reference: 1-94-8404T4

• Aftermarket reference: 398-858404T4

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury / Mariner V6 2.5L two-stroke outboards

• Mercury SportJet 6-cylinder charging systems

• CDM ignition systems using 858404T4 / 174-0002 stator family

  

Typically suits:

  

• Engine models:

• Mercury / Mariner 135HP 2.5L V6 CDM ignition applications

• Mercury / Mariner 140HP Jet / SportJet applications using 858404T4

• Mercury / Mariner 150HP 2.5L V6 CDM ignition applications

• Mercury / Mariner 175HP 2.5L V6 CDM ignition applications

• Mercury / Mariner 200HP 2.5L V6 CDM ignition applications

• Mercury SportJet 240HP 6-cylinder applications using 858404T4

• Mercury V6 2.5L 135HP / 150HP / 175HP / 200HP outboards using 398-858404T4

• Mercury V6 SportJet and 2.5L 135HP-200HP applications using CDI 174-0002 replacement family

  

• HP Range: commonly 135HP - 240HP

• Engine Type: Mercury / Mariner 6-cylinder 2.5L two-stroke outboard and SportJet

• Year Range: approximately 2000-2007 depending on model and serial range

• Charging Output: 40 amp stator family

  

🔌 Function

  

The stator generates ignition charge voltage and high-output charging current under the flywheel. It supplies the ignition system and regulator / rectifier circuit so spark and battery charging remain stable.

  

Common signs of failure:

  

• Weak or missing spark

• Misfire at higher RPM

• Battery not charging

• Voltage regulator overheating or failing repeatedly

• Tachometer drop-out

• Engine starts cold then loses spark hot

• Burnt windings or melted insulation

• Low stator output during high-speed / low-speed DVA testing

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 130.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Stators | Charging Stators & Electrical Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 130.00 AUD | In stock |

## Images

- 858404T4 Mercury Stator | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/858404t4-mercury-stator-genuine-used-part)
> Updated: 2026-07-06