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

High-quality marine-grade aftermarket CDI ignition unit / power pack / switch box for selected Mercury and Mariner 3-cylinder 2-stroke outboard engines.

Designed for selected:

75 HP / 90 HP Mercury & Mariner Outboards

and selected:

65 Jet / 95 SportJet Applications

primarily from approximately 1994–1997, depending on the exact model and serial number.

This is the 3-cylinder switch-box family cross-referenced to:

18495A26 / CDI 114-4953

Fits Selected Mercury / Mariner Outboards

65 Jet

Selected 65 Jet 3-cylinder 2-stroke applications.

Common application period:

Approx. 1994–1997

75 HP

Selected 75 HP 3-cylinder 2-stroke Mercury / Mariner outboards.

Your existing application data includes:

Serial Number:

0D283222 – 0G437999

Approximate application:

1994–1996

90 HP

Selected 90 HP 3-cylinder 2-stroke Mercury / Mariner outboards.

Your existing application data includes:

Serial Number:

0C222000 – 0G437999

Approximate application:

1993–1996

Also selected applications within:

0E080400 – 0E145579

Approx. 1995–1996

95 SportJet

Selected Mercury:

95 HP SportJet

3-cylinder 2-stroke applications.

Your existing application data includes:

Serial Number:

0E141089 – 0E315900

Approximate application:

1995–1997

Fitment Summary

Application	Engine	Approx. Period
65 Jet	3 Cyl 2 Stroke	Selected 1994–1997
75 HP	3 Cyl 2 Stroke	Selected 1994–1996
90 HP	3 Cyl 2 Stroke	Selected 1993–1996
95 SportJet	3 Cyl 2 Stroke	Selected 1995–1997

⚠️ IMPORTANT

These year ranges are provided as a fitment guide only.

Please do NOT order by horsepower or year alone.

Mercury and Mariner used several different ignition systems depending on model and serial number.

Replaces Mercury / Mariner Part Numbers

18495A10
18495A12
18495A15
18495A18
18495A19
18495A26

Main Current Cross Reference

18495A26

The earlier 18495A12 switch box is documented as being superseded through 18495A19 to 18495A26.

Additional Cross References

CDI Electronics 114-4953
Sierra 18-5790
Sierra 18-5790-1
Mallory 9-25107

The former CDI Electronics 114-4953 is now cross-referenced to Sierra 18-5790-1.

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

3-Cylinder Switch Box

This CDI is specifically from the:

3-CYLINDER 18495 / 114-4953 SWITCH-BOX FAMILY

The Mercury parts catalogue also shows 18495A12 → 18495A19 → 18495A26 as switch-box replacements on applicable 3-cylinder ignition systems.

Do not confuse this with other 18495 switch boxes.

Mercury used similar-looking 18495-series CDI units for different engines and cylinder configurations.

For example, CDI cross-reference information identifies:

18495A10 / A12 / A18 / A19 / A26 → 3-cylinder 114-4953 family
Other 18495 references → different 2-cylinder or 6-cylinder CDI units.

⚠️ IMPORTANT – Check Before Ordering

Please check your existing CDI / switch box before purchasing.

Confirm:

Engine horsepower
Complete engine serial number
3-cylinder engine
2-stroke engine
Original switch-box part number
Electrical connections
Wiring arrangement
Mounting arrangement

Ideally, your original CDI should cross-reference to:

18495A10

18495A12

18495A15

18495A18

18495A19

or

18495A26

3-Bolt Mounting

This switch box is secured to the applicable electrical mounting panel using:

3 Mounting Bolts

Mercury parts information for the applicable ignition assembly identifies three mounting screws for the switch-box installation.

Please compare the mounting arrangement and electrical connections with your existing unit before ordering.

⚠️ Appearance Does Not Confirm Fitment

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

Different Mercury / Mariner switch boxes can look almost identical but have different:

Internal specifications
Cylinder applications
Wiring
Electrical connections
Ignition characteristics

Always check the original part number and complete engine serial number.

What Is a CDI / Switch Box?

The CDI / switch box is an important part of the Mercury / Mariner ignition system.

It receives electrical signals from the ignition system and controls the output used to fire the ignition coils.

A faulty CDI / switch box can be associated with symptoms such as:

No spark
Loss of spark on one or more cylinders
Intermittent spark
Difficult starting
Engine misfiring
Engine cutting out
Loss of ignition when hot
Poor acceleration
Irregular engine operation

Important

These symptoms do NOT automatically mean the CDI is faulty.

Similar symptoms can be caused by the stator, trigger, ignition coils, stop circuit, wiring or poor electrical connections.

Proper diagnosis is recommended before replacing the CDI.

Before Replacing Your CDI / Switch Box

If your engine has an ignition problem, we recommend checking the complete ignition system before installing a replacement CDI.

Check:

Stator output
Trigger output
Ignition coils
Spark plugs
Spark plug leads
Stop / kill circuit
Engine earth / ground connections
CDI wiring
Electrical connectors
Burnt or corroded terminals
Damaged wiring

A fault elsewhere in the ignition system can produce symptoms similar to a failed CDI and may damage a replacement component.

Product Features

Marine-grade aftermarket CDI unit
CDI ignition module
Power pack
Switch box
Suitable for selected Mercury outboards
Suitable for selected Mariner outboards
75 HP
90 HP
Selected 65 Jet
Selected 95 SportJet
2 Stroke
3 Cylinder
3-bolt mounting arrangement
Replacement for 18495A10
Replacement for 18495A12
Replacement for 18495A15
Replacement for 18495A18
Replacement for 18495A19
Replacement for 18495A26
Cross-reference CDI 114-4953
Direct replacement for compatible applications
New aftermarket ignition component

Aftermarket Replacement Part

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

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

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

The component is designed as a replacement for compatible Mercury / Mariner applications using the:

18495A26 / 114-4953 3-Cylinder Switch-Box Family

What's Included

1 × CDI Unit / Power Pack / Switch Box

New aftermarket replacement component.

Buyer Responsibility

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

Please check:

Mercury / Mariner engine
Engine horsepower
2 Stroke
3 Cylinder
Complete engine serial number
Original CDI part number
Electrical connections
Mounting arrangement

If you are unsure, please send SSI Marine:

Engine horsepower + complete serial number + clear picture of your existing CDI and connections

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

75 HP 90 HP Mercury Mariner Outboard 2 Stroke 3 Cyl CDI Switch Box 18495A26