CDI / Switch Box / Power Pack for Mercury & Mariner Outboards

High-quality marine-grade aftermarket ignition switch box / CDI power pack for a wide range of selected Mercury and Mariner 2-stroke outboard engines.

Suitable for selected:

• 3 Cylinder
• Inline 6 Cylinder
• V6
• Selected Jet / Sport Jet
• Selected Force 3 Cylinder

applications.

Designed as a replacement for the Mercury / Mariner 332-5524 and 332-7778 switch box families.

Replaces Mercury / Mariner Part Numbers

• 332-5524
• 332-5524A1
• 332-7778
• 332-7778A1
• 332-7778A3
• 332-7778A5
• 332-7778A6
• 332-7778A9
• 332-7778A12

Aftermarket Cross References

• CDI Electronics 114-7778
• Mallory 9-25100

Depending on the age of the engine and parts catalogue, the original Mercury number may appear with a different suffix.

Fits Selected Mercury / Mariner Outboards

3 Cylinder Applications

50 HP

Electric Start

Serial Range:

0A912478 – 0D000749

Approx. 1986–1990

60 HP

3 Cylinder – Electric Start

Serial Range:

6428681 – 0D000749

Approx. 1984–1990

65 HP

3 Cylinder – Electric Start

Serial Range:

4382057 – 4571651

Approx. 1976

70 HP

3 Cylinder – Electric Start

Serial Range:

4571652 – 0D283221

Approx. 1977–1993

75 HP

3 Cylinder – Electric Start

Serial Range:

0A996142 – 0D283221

Approx. 1987–1993

80 HP

3 Cylinder – Electric Start

Serial Range:

0A996142 – 0C221999

Approx. 1987–1989

90 HP

3 Cylinder – Electric Start

Serial Range:

0A996142 – 0C221999

Approx. 1987–1989

90 HP Sport Jet

Selected 3-cylinder Sport Jet applications.

Serial Range:

0E021000 – 0E095087

Approx. 1995

Inline 6 Cylinder Applications

90 HP

Selected Inline 6 engines.

Serial Range:

5299506 – 0B110053

Approx. 1979–1986

115 HP

Selected Inline 6 engines.

Serial Range:

5314656 – 0C100000

Approx. 1979–1989

140 HP

Selected Inline 6 engines.

Serial Range:

5327663 – 5669999

Approx. 1980–1981

V6 Applications

135 HP

Selected V-135 / V6 engines.

Serial Range:

0A904646 – 0G840500

Approx. 1985–2000

150 HP

Selected V-150 / V6 engines.

Serial Range:

4868998 – 0G840500

Approx. 1978–2000

175 HP

Selected V-175 / V6 engines.

Serial Range:

4301235 – 0G840500

Approx. 1976–2000

200 HP

Selected V-200 / V6 engines.

Serial Range:

4839034 – 0G840500

Approx. 1978–2000

220 HP EFI

Selected V6 220 EFI applications.

Serial Range:

0B117316 – 0C100860

Approx. 1987–1988

225 HP

Selected 2.4L V6 applications.

Serial Range:

5628028 – 0D280812

Approx. 1980–1993

250 HP

Selected 3.4L V6 applications.

Serial Range:

0C101891 – 0D280900

Approx. 1989–1994

275 HP

Selected 3.4L V6 applications.

Serial Range:

0C101891 – 0D280900

Approx. 1989–1994

300 HP

Selected 3.4L V6 applications.

Serial Range:

5611648 – 0A996135

Approx. 1980–1987

Mercury Jet Applications

105 HP Jet

Selected 6-cylinder Jet applications.

Serial Range:

0D082000 – 0G840500

Approx. 1992–2000

140 HP Jet

Selected 6-cylinder Jet applications.

Serial Range:

0D082000 – 0G760300

Approx. 1992–1999

Selected Force Outboard Applications

This switch box family is also used on selected Force 3-cylinder outboards.

70 HP Force

3 Cylinder

Serial Range:

0E000001 – 0E009499

Approx. 1991–1992

90 HP Force

Selected 3-cylinder applications including:

• 1991 D models
• 1992 L-Drive B & D models

Force fitment is particularly model-specific.

Please confirm the original ignition-module number and engine details before ordering.

What Is a Switch Box?

The switch box is an important part of the outboard's CDI ignition system.

It receives the relevant electrical signals from the stator and trigger system and controls the ignition output to the coils.

A faulty switch box can be associated with ignition problems such as:

• No spark
• Intermittent spark
• Loss of spark on one or more cylinders
• Difficult starting
• Engine cutting out
• Ignition problems at certain RPM

Important

These symptoms can also be caused by the stator, trigger, ignition coils, wiring, grounds or other electrical components.

The switch box should be properly diagnosed before replacement.

Product Features

• Marine-grade aftermarket CDI / switch box
• Direct replacement for compatible applications
• Suitable for selected Mercury outboards
• Suitable for selected Mariner outboards
• Selected Force applications
• Selected 3-cylinder engines
• Selected Inline 6 engines
• Selected V6 engines
• Selected Jet / Sport Jet applications
• Replacement for 332-5524 family
• Replacement for 332-7778 family
• Plug-and-play installation on compatible applications
• No assembly required
• New aftermarket ignition component

⚠️ IMPORTANT – Some V6 Engines Use TWO Switch Boxes

Many applicable Mercury / Mariner V6 2-stroke engines use two switch boxes, with one unit controlling each bank of three cylinders.

This listing is for ONE switch box unless otherwise stated.

If diagnosing a V6 ignition problem, check both switch boxes and the complete ignition system.

Do not automatically assume that replacing one switch box will correct an ignition fault without proper testing.

⚠️ VERY IMPORTANT – Check Serial Number

Mercury / Mariner ignition parts are highly dependent on the engine serial number.

Do NOT order by horsepower alone.

The same horsepower engine can use different switch boxes depending on:

• Model
• Engine generation
• Serial number
• Number of cylinders
• Ignition-system specification
• Original switch-box part number

Please compare your COMPLETE serial number with the fitment information above.

⚠️ Check the Original Part Number

For the safest identification, compare the number on your original switch box with one of the replacement numbers listed above.

Common references include:

332-5524

332-5524A1

332-7778

332-7778A1

332-7778A3

332-7778A5

332-7778A6

332-7778A9

332-7778A12

⚠️ Appearance Does Not Confirm Fitment

If the switch box looks the same as the one fitted to your engine, this does not always mean it is the correct part for your outboard.

Mercury used several ignition modules that can look very similar externally but have different internal specifications and applications.

Please check the original part number and complete engine serial number before purchasing.

Before Installing Your New Switch Box

If your original switch box has failed, we recommend checking the complete ignition system before fitting the replacement.

Check:

• Stator output
• Trigger output
• Ignition coils
• Spark plug leads
• Engine grounds / earth connections
• Switch-box wiring
• Electrical connectors
• Burnt or corroded terminals
• Damaged or melted wiring
• Battery and charging system where applicable

A fault elsewhere in the ignition system can cause similar symptoms and may damage a replacement component.

Aftermarket Replacement Part

This is a high-quality marine-grade aftermarket replacement part.

It is not a genuine Mercury, Mariner or Force component.

OEM manufacturer names and part numbers are provided for identification and compatibility reference only.

The component is designed as a replacement for compatible applications using the 332-5524 / 332-7778 switch-box family.

Buyer Responsibility

It is the buyer's responsibility to confirm compatibility before purchasing.

Please check:

• Engine manufacturer
• Horsepower
• Number of cylinders
• Engine model
• Complete serial number
• Original switch-box part number
• Electrical connections

If you are unsure, contact SSI Marine with your engine horsepower and complete serial number before ordering. Our technical team will be happy to help identify the correct ignition unit.

Why Buy From SSI Marine?

• Marine-grade aftermarket & OEM-spec parts
• Workshop-tested products
• More than 10 years supplying and working with outboard engines
• Same-day dispatch before 1 PM Monday–Friday
• Royal Mail Tracked 24
• UK stock
• Collection available from Leigh, Greater Manchester
• Technical support from experienced outboard specialists
• Workshop open Monday–Friday, 9 AM–5 PM