Alternator – Fits Mercury Outboards V-6 DFI/Optimax (Replaces 8M0064020, 881247A1, 875286A1)
Alternator – Fits Mercury Outboards V-6 DFI/Optimax (Replaces 8M0064020, 881247A1, 875286A1) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Alternator – Fits Mercury Outboards V-6 DFI/Optimax (Replaces 8M0064020, 881247A1, 875286A1) is backordered and will ship as soon as it is back in stock.
Product Details
This high-quality replacement Alternator fits Mercury Outboards with V-6 DFI/Optimax technology. It is specifically designed for use on 200-225 HP 3.0L models, providing reliable charging performance.
This unit serves as a direct interchange for Mercury part numbers 8M0064020, 8M6013461, 881247A1, 875286A1, 828506, and 875286T.
- Installs as a direct replacement for the original OEM part.
- Features a connection compatible with the factory OEM wiring harness.
- Covered by a 1-year warranty when purchased new.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Mercury | 8M0064020 | 8M6013461 |
| Mercury | 881247A1 | |
| Mercury | 875286A1 | |
| Mercury | 828506 | |
| Mercury | 875286T |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury engines, please ensure your model is a V-6 3.0L with DFI/Optimax technology.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | Optimax/DFI V-6 3.0L | 200-225 | 2-Stroke | 8M0064020 | Superseded by 8M6013461 |
Technical Specs
- Product Type
- Alternator
- Installation
- Direct Replacement OEM
- Connection
- OEM Wiring Harness Compatible
- Housing Color
- Black
- Product Dimensions (L x W x H)
- 19.0 x 19.0 x 20.5 cm
- Warranty
- 1 Year (when purchased new)
- Other Technical Attributes
- 12V System, Delco/Remy Design
What’s in the Box
- 1 x Alternator (8M0064020/8M6013461)
Installation Notes
- Disconnect the negative terminal from your boat's battery to prevent electrical shorts.
- Loosen the belt tensioner and carefully remove the serpentine belt from the alternator pulley.
- Unplug the main wiring harness and disconnect the battery cable from the back of the old alternator.
- Remove the mounting bolts securing the alternator to the engine block.
- Carefully lift the old alternator out of the engine bay.
- Position the new alternator and loosely tighten the mounting bolts.
- Reconnect the electrical connectors and battery cable.
- Reinstall the serpentine belt and apply the correct tension using the tensioner.
- Tighten all mounting bolts to the manufacturer's specified torque.
- Reconnect the battery terminal, start the engine, and verify the charging system is operating correctly.
Troubleshooting & FAQ
How do I know if my alternator is failing?
Common signs of a faulty alternator include dimming or flickering lights, a battery warning light on your dashboard, a weak or dead battery, frequent battery jumps, or a whining/grinding noise coming from the engine area.
Will this alternator fit my Optimax engine?
This unit is specifically designed as a replacement for alternators on Mercury V-6 DFI/Optimax 3.0L (200-225 HP) engines. To guarantee fitment, always compare your original part number to the references listed in our Part Number Matrix.
Do I need to modify my boat's wiring?
No. This alternator is engineered to be compatible with the factory OEM wiring harness, allowing for a direct, plug-and-play installation without any modifications.
What is the output amperage of this alternator?
While a specific amperage rating is not provided, this alternator is manufactured to meet or exceed the electrical demands and specifications of the original factory part for all listed compatible models.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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