# 18495A26 Mercury Switchbox | Genuine Used Part

🔧 Product Description

  

Genuine Mercury Switch Box / Ignition Module - Part Number: 18495A26

  

A genuine Mercury switch box used in selected Mercury and Mariner two-stroke ignition systems. This module controls ignition energy discharge to the coils and is a critical part of the outboard spark system.

  

⚙️ Key Features

  

• Genuine Mercury switch box

• Correct part number 18495A26

• Ignition discharge module for Mercury / Mariner two-stroke systems

• Related to the 18495 switch-box family

• Must be matched by exact serial-numbered ignition diagram

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 18495A26 listed Mercury switch box reference

• 18495A19 related earlier switch box reference

• 18495A15 related earlier switch box reference

• 18495A11 related earlier switch box reference

  

OEM / Related Numbers:

  

• 18495A26

• 18495-A26

• 18495A19

• 18495A15

• 18495A11

• Switch box assembly

• Ignition control box

• Mercury ADI ignition module family

  

Aftermarket / Verified Equivalents:

  

• CDI Electronics switch-box replacements may be available by matching exact 18495A26 application

• Sierra switch-box equivalents may be available by serial-numbered ignition system

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury / Mariner two-stroke switch-box ignition systems

  

Typically suits:

  

• Engine models:

• Mercury two-stroke outboards using 18495A26 switch box

• Mariner two-stroke outboards using 18495A26 switch box

• Mercury ADI ignition systems where the serial-numbered diagram specifies 18495A26

• Mercury inline and V-family ignition systems using the 18495 switch-box family

  

• HP Range: application-dependent Mercury / Mariner two-stroke ignition systems

• Engine Type: Mercury / Mariner two-stroke outboard

• Year Range: serial-number controlled

• Serial / Model Note: Match by exact Mercury serial number, switch-box part number, number of boxes fitted and wiring colour layout.

  

🔌 Function

  

The switch box stores and releases ignition energy to the ignition coils when triggered by stator and trigger circuits.

  

Common signs of failure:

  

• No spark or weak spark

• Intermittent spark loss when hot

• Hard starting or no-start condition

• Misfire under load

• Fault remains after stator, trigger, coil and harness checks

• Water, heat or corrosion damage at connectors

• Spark returns when a known-good module is fitted

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 100.0 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 | 100.00 AUD | In stock |

## Images

- 18495A26 Mercury Switchbox | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/18495a26-mercury-switchbox-genuine-used-part)
> Updated: 2026-06-29