# 879984 8m0077471 Mercury Coil | Genuine Used Part

🔧 Product Description

  

Genuine Mercury Ignition Coil Kit - Part Numbers: 879984 and 8M0077471

  

A genuine OEM electrical component used on the matching marine engine electrical system. This part must be matched by exact part number, model and serial details before installation.

  

⚙️ Key Features

  

• Genuine OEM electrical component

• Correct part number reference 879984 / 8M0077471

• Full electrical diagnostic relevance

• Requires exact model and serial confirmation

• Used in marine ignition, charging, harness, trim or control systems where specified

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 8M0077471 → Supersedes 879984A1

• 879984A1 earlier ignition coil kit reference

• 879984T01 related ignition coil reference

• 879984T00 related ignition coil reference

  

OEM / Related Numbers:

  

• 8M0077471

• 300-8M0077471

• 879984

• 879984A1

• 339-879984A1

• 879984T01

• 300-879984T01

• 879984T00

  

Aftermarket / Verified Equivalents:

  

• DB Electrical: 160-01078

• Aftermarket ignition coil replacement for 300-8M0077471 / 300-879984T01

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury Ignition Coil Kit applications

  

Typically suits:

  

• Engine models:

• Mercury 90HP OptiMax applications using 879984 coil family

• Mercury 75HP / 90HP / 115HP DFI / OptiMax applications where specified

• Mercury EFI / Racing outboard applications using 879984T01 / 8M0077471 coil family

  

• HP Range: commonly 75HP - 115HP DFI / OptiMax, with additional Mercury EFI applications where specified

• Engine Type: Mercury DFI / OptiMax / EFI outboard ignition system

• Year Range: 2000s Mercury ignition coil family use depending on serial range

• Serial / Model Note: Match by engine serial number, coil connector and ignition diagram.

  

🔌 Function

  

This component performs its assigned ignition, charging, trim, control or signal function within the outboard electrical system.

  

Common signs of failure:

  

• Cylinder misfire

• Weak or no spark

• Misfire under load

• Coil fault follows cylinder swap

• Hard starting

• PCM ignition fault code

• Cracked coil body or corroded plug tower

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 90.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Electronic Components | ECU CDI & Electrical Parts

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 90.00 AUD | In stock |

## Images

- 879984 8m0077471 Mercury Coil | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/879984-8m0077471-mercury-coil-genuine-used-part)
> Updated: 2026-06-29