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
PRODUCT DETAILS
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 Mercury parts information confirms that 339-7452A15 was superseded by 7452A19.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
SHIPPING & DELIVERY
Delivery & Returns Policy
Delivery
Standard Delivery
- £6: Royal Mail Tracked 24 Service
- £3.99: Large Letter - Royal Mail 1st Class Post (Untracked)
We offer free delivery on all orders over £150 (excludes outboard engines).
Orders placed before 1:00 PM (Monday-Friday) are usually dispatched the same working day.
Most parcels are delivered within 24 hours, but please allow extra time for courier delays that may occur outside our control.
For outboard engines, please contact us for a delivery quote.
Important: Please ensure your shipping address is correct before completing checkout. SSI Marine is not responsible for parcels sent to an incorrect address provided by the buyer.
Tracking Your Order
Once your order has been dispatched, you will receive a tracking number via email (after 5 PM on the day of dispatch).
Tracking is available only for parcels sent via Royal Mail Tracked 24.
Large Letter orders are sent via Royal Mail 1st Class Post (untracked).
Returns
We accept returns of unused and undamaged items within 30 days of purchase.
Returned items must be in sellable condition and include the original packaging.
Please do not tape, label, or write directly on the product's original box.
Important: Do not return items in their original product boxes only, they must be placed inside a protective outer box or bag. Parcels returned like the example below will be subject to a 20% restocking fee.
Return shipping costs are the customer's responsibility.
Please include your order details and reason for return inside the parcel.
Refunds
Refunds are issued for the item purchase price only (shipping costs are non-refundable).
All refunds will be made using the same payment method as your original order.
Items returned in poor condition or without proper packaging may incur a 20% restocking fee.
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