Alternator – Fits Volvo Penta Marine Engines 3.0L-8.1L (Replaces 3860082, AC165622)
Alternator – Fits Volvo Penta Marine Engines 3.0L-8.1L (Replaces 3860082, AC165622) 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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Alternator – Fits Volvo Penta Marine Engines 3.0L-8.1L (Replaces 38...
Product Details
This marine alternator is designed for Volvo Penta inboard and sterndrive engines from 3.0L to 8.1L (1993–2007). It delivers a reliable 12V/65A output and features a 6-groove serpentine pulley and dual mounting feet for a secure fit.
It serves as a direct replacement for several OEM and aftermarket part numbers, including Volvo Penta 3860082 and 3860798, Arco 60072, Sierra 18-5979, and Mando AC165622.
- Direct OEM Replacement Installation
- Ignition Protected (SAE J1171 Certified) for marine environments
- Includes a 1-Year Warranty for peace of mind
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3860082 |
| Volvo Penta | 3860798 |
| Arco Marine | 60072 |
| Sierra Marine | 18-5979 |
| API Marine | 20105 |
| Mando | AC165622 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Compatible with the following Volvo Penta inboard and sterndrive engines:
| Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| 3.0GS | 181ci 3.0L | 4-Stroke | 1993–1999 | 3860082 | |
| 3.0GSM | 181ci 3.0L | 4-Stroke | 2000–2002 | 3860082 | |
| 3.0GSP | 181ci 3.0L | 4-Stroke | 2000–2002 | 3860082 | |
| 4.3GXi Osi | 262ci 4.3L | 4-Stroke | 2000–2007 | 3860082 | |
| 5.0Gi | 305ci 5.0L | 4-Stroke | 1997–1999 | 3860082 | |
| 5.0GL | 305ci 5.0L | 4-Stroke | 1997–1999 | 3860082 | |
| 5.0GXi Osi | 305ci 5.0L | 4-Stroke | 2001–2007 | 3860082 | |
| 5.7Gi | 350ci 5.7L | 4-Stroke | 2000–2007 | 3860082 | |
| 5.7GiL | 350ci 5.7L | 4-Stroke | 2000–2007 | 3860082 | |
| 5.7GSiL | 350ci 5.7L | 4-Stroke | 2000–2002 | 3860082 | |
| 5.7GXi | 350ci 5.7L | 4-Stroke | 2000–2007 | 3860082 | |
| 5.7GXiL | 350ci 5.7L | 4-Stroke | 2000–2007 | 3860082 | |
| 5.7OSi | 350ci 5.7L | 4-Stroke | 2000–2007 | 3860082 | |
| 5.7OSXi | 350ci 5.7L | 4-Stroke | 2000–2007 | 3860082 | |
| 7.4Gi | 454ci 7.4L | 4-Stroke | 1994–1999 | 3860082 | |
| 7.4Gsi | 454ci 7.4L | 4-Stroke | 1994–1999 | 3860082 | |
| 8.1Gi | 496ci 8.1L | 4-Stroke | 2000–2007 | 3860082 | |
| 8.1GiL | 496ci 8.1L | 4-Stroke | 2000–2007 | 3860082 | |
| 8.1GSi | 496ci 8.1L | 4-Stroke | 2000–2002 | 3860082 | |
| 8.1GSiL | 496ci 8.1L | 4-Stroke | 2000–2002 | 3860082 | |
| 8.1GXi | 496ci 8.1L | 4-Stroke | 2000–2007 | 3860082 | |
| 8.1GXiL | 496ci 8.1L | 4-Stroke | 2000–2007 | 3860082 | |
| 8.2GSi | 502ci 8.2L | 4-Stroke | 1994–1999 | 3860082 | |
| DPX375 | 496ci 8.1L | 4-Stroke | 2000–2002 | 3860082 | |
| DPX385 | 454ci 7.4L | 4-Stroke | 2000 | 3860082 | |
| DPX415 | 502ci 8.2L | 4-Stroke | 2000 | 3860082 | |
| DPX420 | 496ci 8.1L | 4-Stroke | 2000–2002 | 3860082 | |
| DPX500 | 502ci 8.2L | 4-Stroke | 2000–2002 | 3860082 | Specifically mentioned in product title |
| DPX525 | 502ci 8.2L | 4-Stroke | 2000–2002 | 3860082 | Specifically mentioned in product title |
| DPX600 | 540ci 8.8L | 4-Stroke | 2000–2002 | 3860082 | Specifically mentioned in product title |
Technical Specs
- Product Type
- Marine Alternator
- Installation
- Direct OEM Replacement
- Voltage
- 12 Volts
- Amperage
- 65 Amps
- Pulley Type
- 6-Groove Serpentine
- Pulley Diameter
- 67mm
- Regulator Type
- Internal Regulator (IR)
- Mounting
- Dual 2" Mounting Feet
- Dimensions
- 16.0 x 25.0 x 25.0 cm
- Weight
- 14 pounds (6.35 kg)
- Certification
- Ignition Protected SAE J1171
- Warranty
- 1-Year Warranty
What’s in the Box
- 1 x Alternator (Replaces OEM 3860082/3860798)
Installation Notes
- Disconnect the battery's negative terminal before starting.
- Loosen the serpentine belt tensioner and remove the belt from the alternator pulley.
- Identify and disconnect all electrical connectors from the old alternator.
- Unbolt and carefully remove the old alternator from its mounting brackets.
- Visually compare the new alternator with the old unit to confirm an identical match in size, mounting points, and pulley design.
- Position the new alternator and secure it with the mounting bolts. Do not fully tighten yet.
- Reconnect all electrical connectors securely.
- Reinstall the serpentine belt, ensuring it is correctly routed and tensioned. Then, tighten the mounting bolts to the manufacturer's specified torque.
- Reconnect the battery's negative terminal.
- Start the engine and check for proper operation. Verify the charging system voltage is within the correct range using a multimeter.
Troubleshooting & FAQ
How do I know if this alternator fits my engine?
To ensure compatibility, check that your engine's model and year are listed in the Engine & Model Compatibility table. It is also critical to cross-reference your existing alternator's part number with the numbers in our Part Number Matrix.
What are the signs of a failing alternator?
Common symptoms of a bad alternator include dimming headlights, a battery warning light on your dashboard, a weak or dead battery, or a whining/grinding noise coming from the engine area while it's running.
Is this a difficult part to install?
For an individual with automotive or marine mechanical experience, the installation is generally straightforward as it's a direct-fit part. However, due to its role in the boat's electrical system, we strongly recommend professional installation to ensure safety and correct operation.
What is the main difference between this and an OEM part?
This is a high-quality aftermarket part designed to meet or exceed original equipment manufacturer (OEM) specifications in terms of fit, form, and function. The key difference is that it is not produced by the original engine manufacturer, allowing us to offer comparable quality at a more competitive price.
Why is the 6-groove serpentine pulley important?
The 6-groove serpentine pulley is specifically designed to match the serpentine belt system used on the compatible Volvo Penta engines. Using an alternator with a different pulley type (e.g., a V-belt pulley) would not work, as the belt would not align or function correctly.
Does this alternator require any maintenance?
Marine alternators like this one are designed to be maintenance-free. The best practice is to periodically inspect the serpentine belt for wear and proper tension and to ensure all electrical connections remain clean, dry, and secure.
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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