12V 70A Alternator – Fits Volvo Penta 3.0GL/GLM/GLP, 4.3GXi/OSi & 5.7Gi/GXi Series (Replaces 3884950, 3862613)
12V 70A Alternator – Fits Volvo Penta 3.0GL/GLM/GLP, 4.3GXi/OSi & 5.7Gi/GXi Series (Replaces 3884950, 3862613) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
12V 70A Alternator – Fits Volvo Penta 3.0GL/GLM/GLP, 4.3GXi/OSi &am...
Product Details
This 12V 70A Alternator is a direct-fit replacement for a range of Volvo Penta marine gasoline engines from 2000–2007, including the 3.0L 4-cylinder, 4.3L 6-cylinder, and 5.0L/5.7L 8-cylinder series. It ensures reliable charging performance for models like the 3.0GLM, 4.3GXi, and 5.7Gi.
It serves as a direct replacement for Volvo Penta part numbers 3862613, 3862665, and 3884950, as well as cross-references to Mercruiser 8M6007508 and Valeo 2655300, 2655301, and 425302.
- Installation: Direct OEM replacement fit
- Regulator: Features a reliable internal regulator
- Pulley: Comes standard with a 6-groove serpentine pulley
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3862613 |
| Volvo Penta | 3862665 |
| Volvo Penta | 3884950 |
| Mercruiser | 8M6007508 |
| Valeo | 2655300 |
| Valeo | 2655301 |
| Valeo | 425302 |
Engine & Model Compatibility
Confirm your engine model and year range in the table below to ensure correct fitment.
This alternator is designed for the following Volvo Penta marine engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 3.0GLM | 3.0L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 3.0GLP-A, B | 3.0L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 3.0GL | 3.0L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 4.3GXi | 4.3L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 4.3OSi | 4.3L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 5.0GL | 5.0L | 4-Stroke | 2000–2007 | 3884950 | Also fits GXi/OSi (2001-2007) |
| Volvo Penta | 5.7Gi | 5.7L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 5.7GiL | 5.7L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 5.7GXi | 5.7L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 5.7GXiL | 5.7L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 5.7OSi | 5.7L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 5.7OSXi | 5.7L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 8.1Gi | 8.1L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 8.1GiL | 8.1L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 8.1GXi | 8.1L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 8.1GXiL | 8.1L | 4-Stroke | 2000–2007 | 3884950 | |
| Volvo Penta | 8.1OSi | 8.1L | 4-Stroke | 2001–2007 | 3884950 | |
| Volvo Penta | IPS500G | 8.1L | 4-Stroke | 2007 | 3884950 |
Technical Specs
- Product Type
- Marine Alternator
- Output
- 12V 70A
- Fuel Type
- Gasoline
- Installation
- Direct OEM Replacement
- Regulator
- Internal
- Pulley Type
- Serpentine
- Pulley Grooves
- 6
- Pulley Diameter
- 60mm
- Mounting
- Dual 2" Mounting Feet
- Housing
- Black Metal
- Earth Return
- Yes
- Dimensions
- 20.5cm × 19.0cm × 19.0cm
What’s in the Box
- 1 × Marine Alternator (Replaces 3884950, 3862613)
Installation Notes
- Disconnect the vessel's battery terminals (negative first, then positive) to prevent electrical shorts.
- Loosen the tensioner pulley to release and remove the serpentine belt from the alternator.
- Carefully disconnect the main power lead, ground wire, and any sensor connectors from the old alternator.
- Remove the mounting bolts securing the alternator to the engine bracket and lift it out.
- Position the new alternator and hand-tighten the mounting bolts.
- Reconnect the electrical connectors to the correct terminals on the new unit.
- 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 (positive first, then negative) and start the engine to test the new alternator's output.
Troubleshooting & FAQ
How can I verify this alternator fits my specific engine model?
The most reliable method is to match your existing alternator's part number to the numbers listed in our Part Number Matrix. If you cannot find a part number, carefully check your engine model and year against our compatibility table. When in doubt, compare our product photos to your current part.
What are common signs of a failing alternator?
Symptoms include dimming lights, a "Check Battery" or "ALT" warning light on your dashboard, a weak or dead battery, and a whining or grinding noise coming from the engine bay. You can also test the voltage at the battery with the engine running; it should typically be between 13.5 and 14.5 volts.
Is this a direct bolt-on replacement?
Yes, this unit is engineered to be a direct OEM-style replacement. It uses the same mounting points (dual 2" feet) and electrical connections as the original Volvo Penta parts it replaces, requiring no modification for installation.
What is the output rating of this alternator?
This alternator has a rated output of 70 amps at 12 volts, suitable for maintaining battery charge and powering onboard electronics for the specified engine applications.
How often should a marine alternator be replaced?
There is no fixed replacement interval for a marine alternator. Replacement is typically done when the unit fails or shows signs of imminent failure. Longevity depends on usage hours, operating conditions (especially exposure to salt and moisture), and electrical load.
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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