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

High-quality marine-grade aftermarket CDI switch box / power pack for selected Mercury and Mariner 4-cylinder 2-stroke outboards.

Suitable for selected:

40 HP, 45 HP, 50 HP, 75 HP, 80 HP, 85 HP, 100 HP, 115 HP and 125 HP

Also used on selected Jet applications.

Replacement for the Mercury 332-5772A switch-box family.

Fitment

Selected Mercury / Mariner 4-Cylinder 2-Stroke Models

HP	Serial Number / Application
40 HP	0C159200–0G589999
45–50 HP	5531630 & Up
75 HP	6432901 & Up
80 HP	4831999–6432900
80 Jet	0D283222–0G437999
85 HP	4366802–4831998
100 HP	0B209468–0G437999
115 HP	0C100000–0G437999
125 HP	0D283222–0G437999

Approximate application data also identifies:

40 HP – 1989–1997
45 HP – 1981–1989
50 HP – 1976–1985
75 HP – 1984–1988
80 HP – 1978–1983
85 HP – 1976–1977
100 HP – 1988–1996
115 HP – 1989–1997
125 HP – 1994–1996

⚠️ Year ranges are a guide only. Always check the serial number and original switch-box number.

Replaces Mercury / Mariner Part Numbers

332-5772
332-5772A1
332-5772A2
332-5772A3
332-5772A4
332-5772A5
332-5772A7

Additional Cross References

300-03107
CDI Electronics 114-5772
Sierra 18-5881
Sierra 18-5881-1
Mallory 9-25104

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

Product Features

CDI ignition unit / switch box / power pack
Mercury / Mariner applications
4 Cylinder
2 Stroke
Selected 40–125 HP applications
Marine-grade aftermarket replacement
Replacement for 332-5772A7
Cross-reference 300-03107
New

⚠️ Important – Check Compatibility

Please do not order by horsepower or appearance alone.

Mercury / Mariner used different switch boxes depending on engine model and serial number.

Before ordering, check:

Engine horsepower
4-cylinder configuration
Complete serial number
Original switch-box part number
Wiring and electrical connections

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

If unsure, send SSI Marine your engine horsepower + complete serial number + picture of the existing CDI 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 electronic ignition components, as stator, trigger, coil, wiring or kill-circuit 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

40 HP 45 HP 50 HP 75 HP 80 HP 85 HP 100 HP 115 HP 125 HP Mercury Mariner Outboard CDI Switch Box 332-5772A7