PRODUCT DETAILS
Regulator / Rectifier for Mercury Mariner Outboards
High-quality marine-grade aftermarket regulator / rectifier for selected Mercury and Mariner 15 HP and 20 HP 4-stroke EFI outboard engines.
Designed as a replacement for Mercury / Mariner:
8M0134477
Suitable for selected later-generation Electronic Fuel Injection (EFI) models with serial numbers in the 0R... family.
Fits Selected Mercury Mariner 4-Stroke EFI Outboards
15 HP
Selected:
15 HP 4 Stroke EFI
- Electronic Fuel Injection – EFI
- Selected engines with serial numbers beginning 0R...
- Later-generation 15 HP 4-stroke applications
20 HP
Selected:
20 HP 4 Stroke EFI
- Electronic Fuel Injection – EFI
- Selected engines with serial numbers beginning 0R...
- Later-generation 20 HP 4-stroke applications
Replaces Mercury / Mariner Part Number
8M0134477
Also searchable as:
- 8M0134477
- 8M0134477 Rectifier
- 8M0134477 Regulator
- 8M0134477 Regulator Rectifier
EFI Models
This regulator / rectifier is intended for selected later Mercury / Mariner:
15 HP EFI
20 HP EFI
4-stroke outboards.
EFI = Electronic Fuel Injection
This is important because Mercury / Mariner used a different rectifier on earlier carburettor 15 HP and 20 HP 4-stroke engines.
⚠️ EFI vs Carburettor – Important
Mercury / Mariner 15 HP and 20 HP 4-stroke engines can use different rectifiers depending on the engine generation.
Later EFI Models
8M0134477
Suitable for selected later:
- 15 HP EFI
- 20 HP EFI
- 4 Stroke
- 0R... serial-number family
Earlier Carburettor Models
Earlier carburettor 15 HP / 20 HP engines can use:
879147T62
These parts should NOT be selected by horsepower alone.
Please identify whether your engine is EFI or carburettor and check the original part number before ordering.
Product Features
- Marine-grade aftermarket regulator / rectifier
- Suitable for selected Mercury outboards
- Suitable for selected Mariner outboards
- 15 HP EFI
- 20 HP EFI
- 4-stroke applications
- Electronic Fuel Injection
- Selected 0R... serial-number engines
- Replacement for 8M0134477
- Designed for the applicable Mercury / Mariner charging system
- Direct replacement for compatible applications
- No assembly required
- New aftermarket replacement component
⚠️ Important – Serial Number
Mercury / Mariner parts are frequently determined by engine serial number, not simply horsepower and year.
This part is used on selected engines within the 0R... serial-number family, but:
A serial number beginning 0R does NOT by itself guarantee fitment.
Before purchasing, please check:
- Exact horsepower
- 4-stroke engine
- EFI – Electronic Fuel Injection
- Complete engine serial number
- Original regulator / rectifier part number
- Electrical connector
- Wiring configuration
- Mounting arrangement
Ideally, match your original part number to:
8M0134477
⚠️ Important – Check Before Ordering
Do NOT order this regulator / rectifier simply because:
- Your engine is 15 HP
- Your engine is 20 HP
- Your serial number starts with 0R
- The regulator looks the same
Mercury / Mariner used different electrical components across different engine generations.
Please double-check the complete engine details before purchasing.
⚠️ Appearance Does Not Confirm Fitment
If the regulator / rectifier looks the same as the one fitted to your engine, this does not always mean it is the correct part for your outboard.
Different Mercury / Mariner charging-system components can look very similar while having different electrical specifications.
If you are unsure, contact SSI Marine with your complete engine serial number before purchasing.
Before Installing Your New Regulator / Rectifier
If your original regulator / rectifier has failed, we recommend checking the complete charging system before installing the replacement.
Check:
- AC output from the stator
- Battery condition
- Battery terminals
- Engine earth / ground connections
- Stator wiring
- Fuse and fuse holder
- Electrical plugs and connectors
- Burnt or corroded terminals
- Melted or heat-damaged wiring
Any charging-system faults or damaged electrical connections should be repaired before installing the replacement unit.
Suitable high-temperature dielectric grease can be used on applicable electrical connectors.
Aftermarket Replacement Part
This is a high-quality marine-grade aftermarket replacement part.
It is not a genuine Mercury or Mariner component.
OEM manufacturer names and part numbers are provided for identification and compatibility reference only.
The component is designed as a replacement for compatible Mercury / Mariner applications using 8M0134477.
Buyer Responsibility
It is the buyer's responsibility to confirm compatibility before purchasing.
Please check:
- Mercury / Mariner engine
- 15 HP or 20 HP
- 4 Stroke
- EFI specification
- Complete serial number
- Original part number
- Electrical connections
If you are unsure, contact SSI Marine before ordering. Our technical team will be happy to help identify the correct component.
Why Buy From SSI Marine?
- Marine-grade aftermarket & OEM-spec parts
- Workshop-tested products
- More than 10 years supplying and working with outboard engines
- Same-day dispatch before 1 PM Monday–Friday
- Royal Mail Tracked 24
- UK stock
- Collection available from Leigh, Greater Manchester
- Technical support from experienced outboard specialists
- 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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