# 850043A2 Mercury Harness | Genuine Used Part

🔧 Product Description

  

Genuine Mercury Engine Harness - Part Number: 850043A2

  

A genuine Mercury engine wiring harness used on Mercury and Mariner 3-cylinder and 4-cylinder two-stroke outboards. This harness connects key electrical components in the engine electrical system and is commonly used on 65 Jet, 75HP, 90HP, 80 Jet, 100HP, 115HP and 125HP carbureted two-stroke models.

  

⚙️ Key Features

  

• Genuine Mercury engine harness

• Correct Mercury part number 850043A2

• Also listed under Mercury 84-850043A2 harness format

• Used on Mercury / Mariner 3-cylinder and 4-cylinder two-stroke outboards

• Cross-references with CDI and Sierra replacement harness references

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 84-850043A2 Mercury engine harness service format

• 850043A2 Mercury engine harness reference

  

OEM / Related Numbers:

  

• 850043A2

• 84-850043A2

• 850043A 2

• 84-850043A 2

  

Aftermarket / Verified Equivalents:

  

• CDI Electronics: 414-0043

• Sierra: 18-99454

• Sierra / CDI reference: 414-0043

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury / Mariner 3-cylinder two-stroke electrical systems

• Mercury / Mariner 4-cylinder two-stroke electrical systems

  

Typically suits:

  

• Engine models:

• Mercury / Mariner 65 Jet 3-cylinder - USA serial 0G438000 and up / Belgium serial 9937000 and up

• Mercury / Mariner 75HP 3-cylinder - approximately 1996-2006

• Mercury / Mariner 90HP 3-cylinder - serial 9793577 through 0P016999

• Mercury / Mariner 90HP 3-cylinder - USA serial 0G438000 and up / Belgium serial 9937000 and up

• Mercury / Mariner 80 Jet 4-cylinder - approximately 1994-2006

• Mercury / Mariner 80 Jet 4-cylinder - serial 0G760300 through 0T979999

• Mercury / Mariner 80 Jet 4-cylinder - serial 1B000001 and up

• Mercury / Mariner 100HP 4-cylinder - approximately 1994-2006

• Mercury / Mariner 115HP 4-cylinder - approximately 1994-2006

• Mercury / Mariner 125HP 4-cylinder - serial 0D283222 through 0G760299

• Mercury / Mariner 125HP 4-cylinder electrical components using harness 850043A2

  

• HP Range: commonly 65 Jet / 75HP - 125HP

• Engine Type: Mercury / Mariner 3-cylinder and 4-cylinder carbureted two-stroke outboard

• Year Range: approximately 1994-2006 depending on model and serial range

  

🔌 Function

  

The engine harness connects electrical components such as ignition, charging, fuse, warning and engine-control circuits so the outboard electrical system can operate as designed.

  

Common signs of failure:

  

• Intermittent ignition or charging faults

• Melted, brittle or cracked wiring insulation

• Corroded pins or loose connectors

• Electrical faults after engine vibration or movement

• Blown fuse caused by harness short

• No-start or accessory failure caused by broken harness continuity

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 25.0 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 | 25.00 AUD | In stock |

## Images

- 850043A2 Mercury Harness | Genuine Used Part
- 850043A2 Mercury Harness | Genuine Used Part
- 850043A2 Mercury Harness | Genuine Used Part
- 850043A2 Mercury Harness | Genuine Used Part
- 850043A2 Mercury Harness | Genuine Used Part
- 850043A2 Mercury Harness | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/850043a2-mercury-harness-genuine-used-part)
> Updated: 2026-07-05