# 84-850044A2 Mercury 90hp 3Cyl  Carby Coil Loom | Genuine Used Part

🔧 Product Description

  

Genuine Mercury Coil Loom / Ignition Harness - Part Number: 84-850044A2

  

A genuine Mercury ignition coil loom used on selected Mercury / Mariner 90HP three-cylinder carbureted two-stroke outboards. This harness connects the ignition coil circuit into the engine wiring system and must be matched to the correct 3-cylinder carbureted ignition layout.

  

⚙️ Key Features

  

• Genuine Mercury ignition coil loom / harness

• Correct Mercury part number 84-850044A2

• Used on selected 90HP three-cylinder carbureted two-stroke outboards

• Connects ignition coil wiring into the engine harness layout

• Must be matched by serial-numbered Mercury ignition / electrical diagram

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 84-850044A2 current Mercury coil loom / harness reference for matching diagrams

  

OEM / Related Numbers:

  

• 84-850044A2

• 850044A2

• 850044-A2

• Mercury coil loom

• Ignition coil harness

• Coil wiring harness

• 90HP 3-cylinder coil loom

• Carbureted 3-cylinder ignition harness

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury 90HP three-cylinder carbureted two-stroke ignition systems

• Mariner 90HP three-cylinder carbureted two-stroke ignition systems where the same harness layout is fitted

• Coil loom positions on 3-cylinder carbureted engines using the 84-850044A2 harness

  

Typically suits:

  

• Engine models:

• Mercury 90HP 3-cylinder carbureted - serial 0D283222 to 0G760299

• Mercury 90HP 3-cylinder carbureted - serial 0G760300 to 0T979999

• Mercury 90HP 3-cylinder carbureted - serial 0T980000 to 0T999999

• Mercury 90HP 3-cylinder carbureted - serial 1B000001 and up, diagram controlled

• Mariner 90HP 3-cylinder carbureted - serial 9793577 to 0P016999

• Mariner 90HP 3-cylinder carbureted - serial 0P017000 to 0P325499

• Mariner 90HP 3-cylinder carbureted - serial 0P325500 and up, diagram controlled

  

• HP Range: 90HP

• Engine Type: Mercury / Mariner three-cylinder two-stroke carbureted outboard

• Year Range: serial-number controlled

• Serial Note: Confirm the engine serial number, carbureted 3-cylinder ignition layout and coil plug arrangement before installation.

  

🔌 Function

  

The coil loom links the ignition coils to the engine wiring harness, keeping the coil trigger and ground circuits routed correctly across the 3-cylinder ignition system. A damaged loom can create intermittent spark faults even when the coils and switch box are serviceable.

  

Common signs of failure:

  

• Intermittent spark on one or more cylinders

• Engine drops a cylinder when harness is moved

• Misfire under load

• Hard starting or no-start condition

• Cracked insulation or broken wires near coil plugs

• Corroded or loose coil terminals

• Harness plug does not lock securely

• Previous repairs or spliced wiring causing poor ignition signal

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 20.0 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 | 20.00 AUD | In stock |

## Images

- 84-850044A2 Mercury 90hp 3Cyl  Carby Coil Loom | Genuine Used Part
- 84-850044A2 Mercury 90hp 3Cyl  Carby Coil Loom | Genuine Used Part
- 84-850044A2 Mercury 90hp 3Cyl  Carby Coil Loom | Genuine Used Part
- 84-850044A2 Mercury 90hp 3Cyl  Carby Coil Loom | Genuine Used Part
- 84-850044A2 Mercury 90hp 3Cyl  Carby Coil Loom | Genuine Used Part
- 84-850044A2 Mercury 90hp 3Cyl  Carby Coil Loom | Genuine Used Part
- 84-850044A2 Mercury 90hp 3Cyl  Carby Coil Loom | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/84-850044a2-mercury-90hp-3cyl-carby-coil-loom-genuine-used-part)
> Updated: 2026-06-29