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

6-225 HP Mercury Mariner Outboard 2 Stroke Ignition Coil 339-832757A4