Ignition Coil for Mercury / Mariner & Force Outboards

High-quality marine-grade aftermarket ignition coil for a wide range of selected Mercury and Mariner 2-stroke outboards.

Also suitable for selected Force 40–150 HP 2-stroke outboards using the same ignition coil.

Replacement for the 339-7370 / 339-832757 ignition coil family.

Mercury / Mariner Fitment

Suitable for selected Mercury / Mariner 2-stroke applications including:

• 6–40 HP – selected 2-cylinder models

• 45–90 HP – selected 3-cylinder models

• 40–125 HP – selected 4-cylinder models

• 90–225 HP – selected Inline 6 / V6 models

Also used on selected Mercury EFI, XR, Racing and SportJet applications.

⚠️ This does NOT mean every Mercury / Mariner engine between 6 HP and 225 HP uses this coil.

Fitment depends on model, serial number and ignition system.

Force Outboard Fitment

Also fits selected Force 2-stroke outboards, including:

• 40 HP – selected 1992–1995

• 50 HP – selected 1992–1995

• 70 HP – selected 1991–1995

• 90 HP – selected 1991–1995

• 120 HP – selected 1990–1995

• 150 HP – selected 1989–1994

Selected Force applications use the same 18-5186 / 339-832757A4 family ignition coil.

Replaces Mercury / Mariner / Force Part Numbers

• 338-4774A1

• 338-4995A1

• 338-4995A2

• 339-7370A2

• 339-7370A6

• 339-7370A8

• 339-7370A13

• 339-7370A16

• 339-7370A17

• 339-7370A19

• 339-7370A23

• 339-7370B13

• 339-832757A3

• 339-832757A4

• 339-832757B4

• F718475

These references are documented within the same replacement coil family.

Additional Cross References

• Sierra 18-5186

• CDI Electronics 184-0001

• Mallory 9-23200

• Recmar REC300-08309

• EMP 300-08309

• Mercury 8M0219430

• Mercury 8M0230859

Sierra 18-5186 is cross-referenced to Mercury 832757A4, current Mercury numbers 8M0219430 / 8M0230859, Recmar REC300-08309 and CDI 184-0001.

Product Features

• Marine-grade aftermarket ignition coil

• Primarily targeted at Mercury / Mariner

• Also fits selected Force outboards

• 2-stroke applications

• Selected 2, 3, 4, 5 & 6-cylinder engines depending on brand/model

• Replacement for 339-832757A4

• Replacement for 339-7370A23 / 339-7370A8

• New replacement component

What's Included

1 × Ignition Coil

Multi-cylinder engines require multiple coils.

This listing is for ONE ignition coil only.

⚠️ Important – Check Compatibility

Please do not order by horsepower or appearance alone.

Before purchasing, check:

• Engine make

• Horsepower

• Engine model

• Complete serial number

• Original ignition coil part number

• Mounting arrangement

• Electrical connections

If the coil looks the same as yours, this does not always mean it is the correct coil for your outboard.

If unsure, send SSI Marine your engine make + horsepower + complete serial number + original coil number and we will help check compatibility.

Buyer Responsibility

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

Correct diagnosis is recommended before replacing ignition components, as CDI / switch box, stator, trigger, wiring and spark plug faults can produce similar symptoms.

Why Buy From SSI Marine?

• Marine-grade aftermarket & OEM-spec parts

• Workshop-tested products

• More than 10 years supplying outboard parts

• Same-day dispatch before 1 PM Monday–Friday

• Royal Mail Tracked 24

• UK stock

• Collection from Leigh, Greater Manchester

• Technical support from experienced outboard specialists