PRODUCT DETAILS
50-300HP Dual Output Ignition Coil – Mercury / Mariner 4-Stroke EFI (2003 & Up)
Precision-built, marine-grade ignition coil designed for Mercury & Mariner EFI 4-stroke outboards, delivering strong spark performance and reliable ignition.
Fits:
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Mercury / Mariner
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50HP – 300HP
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4-Stroke EFI Models
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2003 & newer
Important: Does NOT fit all engines in this HP range. Always verify your existing part number before purchasing.
Replaces OEM Part Numbers:
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300-8M0044991
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8M0044991
(Other cross references may include 8M004491, 8M0029482 depending on model – verify before ordering)
Product Details
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Dual output coil (fires two spark plugs)
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High-quality aftermarket, marine-grade construction
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Direct replacement (where part numbers match)
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Stable spark under load, corrosion-resistant design
Package Includes
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1 × Dual Output EFI Ignition Coil
Buyer Fitment Notice
This coil will not fit all 50-300HP models.
Mercury used multiple ignition coil types across EFI engines.
You must check your existing part number first.
If unsure, message us with your engine model + serial number, and we will confirm the correct coil for you.
Why Buy From SSI Marine
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Trusted UK marine parts supplier
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Premium aftermarket components
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Fast UK dispatch
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Tracked 24 hr delivery available
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Expert technical support before & after purchase
Shipping
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UK Stock
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Same day dispatch when ordered before 1pm (Mon-Fri)
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Fully tracked delivery
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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