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

Premium-quality aftermarket CDI ignition unit / power pack / switch box for selected Mercury and Mariner 6 HP, 8 HP, 9.9 HP, 10 HP, 15 HP, 20 HP and 25 HP 2-stroke outboard engines.

Designed for selected 2-cylinder Mercury / Mariner engines using the bullet-wire connection type.

Replaces multiple Mercury / Quicksilver 339-7452A series switch boxes, including 339-7452A15 and 339-7452A19. Mercury parts information confirms that 339-7452A15 was superseded by 7452A19.

Fits Mercury / Mariner Outboards

6 HP

2 Stroke
2 Cylinder
Selected applications

8 HP

2 Stroke
2 Cylinder
Selected applications

9.9 HP

2 Stroke
2 Cylinder
Selected applications

10 HP

2 Stroke
2 Cylinder
Selected applications

15 HP

2 Stroke
2 Cylinder
Selected applications

20 HP

2 Stroke
2 Cylinder
Selected applications

25 HP

2 Stroke
2 Cylinder
Selected applications

Application data for the 339-7452A19 family confirms these horsepower ranges, although the exact production years and serial ranges vary considerably by horsepower.

Replaces Mercury / Quicksilver Part Numbers

339-7452A1
339-7452A3
339-7452A7
339-7452A8
339-7452A9
339-7452A10
339-7452A11
339-7452A14
339-7452A15
339-7452A18
339-7452A19
339-7452A20
339-7452A21

Additional Cross References

114-7452K1
Sierra 18-5777
Sierra 18-5778

These numbers are cross-referenced to the same switch-box family.

OEM part numbers are used for identification and reference purposes only.

Product Features

CDI ignition unit
CDI module
Power pack
Switch box
For selected Mercury / Mariner outboards
6 HP
8 HP
9.9 HP
10 HP
15 HP
20 HP
25 HP
2 Stroke
2 Cylinder
Bullet-wire connection type
Marine-grade aftermarket part
Manufactured to OEM specifications
Replacement for corresponding 339-7452A applications
New
UK stock

⚠️ Important – Check the Wire Connections

PLEASE CHECK THE CONNECTIONS ON YOUR EXISTING CDI BEFORE ORDERING.

Mercury / Mariner used different ignition units and connection arrangements.

This CDI is for selected engines using the BULLET-WIRE CONNECTION TYPE. CDI Electronics specifically identifies this 7452-series switch box as fitting engines using the bullet connection pack.

Some engines may have a CDI with bolted / stud-type wire connections.

If your existing CDI has different connections, do not order based only on horsepower or appearance.

Compare:

Original CDI part number
Wire connections
Engine serial number
Number of cylinders
Engine horsepower

Important – Please Check Compatibility

Please do not order by horsepower or appearance alone.

Mercury and Mariner used different ignition systems depending on engine year, serial number and specification.

For the safest identification, check whether your original switch box carries one of the 339-7452A references listed above.

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

If you are unsure, please send us:

Engine serial number + a clear picture of your existing CDI and its connections

and our technical team will be happy to help identify the correct unit.

Why Buy From SSI Marine?

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

6 HP -20 HP '80-'97 CDI UNIT FOR MERCURY MARINER OUTBOARD 6 8 9.9 10 15 20 HP 2STR SWITCH BOX '80-97