Alternator – Fits Volvo Penta 3.0-8.2L Marine Engines (Replaces 3857813)
Alternator – Fits Volvo Penta 3.0-8.2L Marine Engines (Replaces 3857813) 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
Alternator – Fits Volvo Penta 3.0-8.2L Marine Engines (Replaces 385...
Product Details
This aftermarket Alternator fits Volvo Penta 3.0-8.2L Marine Engines and a wide range of Mercruiser engines. It is designed for reliable performance in marine environments, covering Volvo Penta models from 1990–2009 and Mercruiser applications from 1985–2002.
It serves as a direct cross-reference for Volvo Penta numbers 3857813, 3860082, and 3860798; Mercury 807652 and 807652T; Prestolite 20130179; and Mando AC155616 and AC155620.
- Designed for direct-fit installation.
- SAE J1171 Certified for marine use.
- Features a 6-groove serpentine pulley and internal regulator.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3857813 |
| Volvo Penta | 3860082 |
| Volvo Penta | 3860798 |
| Mercury | 807652 |
| Mercury | 807652T |
| Prestolite | 20130179 |
| Mando | AC155616 |
| Mando | AC155620 |
Engine & Model Compatibility
Confirm your engine model and year in the tables below to ensure proper fitment.
This alternator is compatible with a range of Volvo Penta gasoline engines from the 3.0L 4-cylinder to the 8.2L V8, primarily from 1993 to 1999.
It also fits numerous Mercruiser models, including GM-based 4-cylinder, V6, and V8 engines from 1985 through the early 2000s.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 3.0GL | - | 4-Stroke | 1993–1999 | 3857813 | 4-cylinder, 181ci |
| Volvo Penta | 3.0GS | - | 4-Stroke | 1993–1999 | 3857813 | 4-cylinder, 181ci |
| Volvo Penta | 4.3GI | - | 4-Stroke | 1993–1999 | 3857813 | V6, 262ci |
| Volvo Penta | 4.3GL | - | 4-Stroke | 1993–1999 | 3857813 | V6, 262ci |
| Volvo Penta | 4.3GS | - | 4-Stroke | 1993–1999 | 3857813 | V6, 262ci |
| Volvo Penta | 5.0FI | - | 4-Stroke | 1993–1999 | 3857813 | V8, 302ci, Ford engine |
| Volvo Penta | 5.7GI | - | 4-Stroke | 1993–1999 | 3857813 | V8, 350ci |
| Volvo Penta | 5.7GL | - | 4-Stroke | 1993–1999 | 3857813 | V8, 350ci |
| Volvo Penta | 5.7GS | - | 4-Stroke | 1993–1999 | 3857813 | V8, 350ci |
| Volvo Penta | 5.7GSI | - | 4-Stroke | 1993–1999 | 3857813 | V8, 350ci |
| Volvo Penta | 5.8FI | - | 4-Stroke | 1993–1996 | 3857813 | V8, 351ci |
| Volvo Penta | 5.8L | - | 4-Stroke | 1993–1996 | 3857813 | V8, 351ci |
| Volvo Penta | 7.4GL | - | 4-Stroke | 1994–1999 | 3857813 | V8, 454ci |
| Volvo Penta | 8.2GL | - | 4-Stroke | 1994–1999 | 3857813 | V8, 502ci |
| Mercruiser | Model 3.0/3.0LX | - | 4-Stroke | 1990–2009 | 807652 | GM 3.0L, 181ci, 4-cylinder |
| Mercruiser | Model 4.3L (Gen+) | - | 4-Stroke | 1996–2008 | 807652 | GM 4.3L, 262ci, V6 |
| Mercruiser | Model 4.3LH (Gen+) | - | 4-Stroke | 1998–2008 | 807652 | GM 4.3L, 262ci, V6, 4-BBL |
| Mercruiser | Model 4.3LHX (Gen+) | - | 4-Stroke | 1996–1997 | 807652 | GM 4.3L, 262ci, V6, 4-BBL |
| Mercruiser | Model 4.3LX (Gen+) | - | 4-Stroke | 1996–1997 | 807652 | GM 4.3L, 262ci, V6, 2-BBL |
| Mercruiser | Model 5.0L (2-BBL) | - | 4-Stroke | 1985–2002 | 807652 | GM 5.0L, 305ci, V8 |
| Mercruiser | Model 5.0L (Gen+) | - | 4-Stroke | 1998–2002 | 807652 | GM 5.0L, 305ci, V8, 2-BBL |
| Mercruiser | Model 5.7L (2-BBL) | - | 4-Stroke | 1997–2002 | 807652 | GM 5.7L, 350ci, V8 |
| Mercruiser | Model 5.7L (Gen+) | - | 4-Stroke | 1998–2002 | 807652 | GM 5.7L, 350ci, V8, 2-BBL |
| Mercruiser | Model 5.7L EFI (Gen+) | - | 4-Stroke | 1998–2008 | 807652 | GM 5.7L, 350ci, V8 |
| Mercruiser | Model 5.7L MIE | - | 4-Stroke | 1997–2009 | 807652 | GM 5.7L, 350ci, V8 |
| Mercruiser | Model 5.7L Ski (Gen+) | - | 4-Stroke | 1998–2008 | 807652 | GM 5.7L, 350ci, V8 |
| Mercruiser | Model 7.4L (Gen.V) | - | 4-Stroke | 1992–1997 | 807652 | GM 7.4L, 454ci, V8 |
| Mercruiser | Model 8.2 (Gen.V) | - | 4-Stroke | 1993–1996 | 807652 | GM 8.2L, 502ci, V8 |
| Mercruiser | Model 8.2 (500) | - | 4-Stroke | 1994–2000 | 807652 | GM 8.2L, 502ci, V8 |
| Mercruiser | Model 8.2 (600SC) | - | 4-Stroke | 1991–1998 | 807652 | GM 8.2L, 502ci, V8 |
Technical Specs
- Product Type
- Marine Alternator
- Installation
- Direct Replacement
- Voltage
- 12V
- Amperage
- 55-65A (sources vary)
- Regulator
- Internal
- Pulley Type
- Serpentine (6 grooves)
- Design
- IR/EF
- Connection
- Mando Type
- Marine Certification
- SAE J1171
- Dimensions
- 22.6 × 18.4 × 18.3 cm (L × W × H)
- Weight
- 5.7 kg (12.6 lb)
- Warranty
- 2 years (aftermarket)
What’s in the Box
- 1 × Marine Alternator (3857813)
Installation Notes
- Disconnect the battery's negative terminal to prevent electrical shorts.
- Loosen the alternator pivot bolt and adjusting bolt, then remove the serpentine belt.
- Disconnect the wiring harness and output cable from the old alternator.
- Remove the mounting bolts and lift the old alternator out of the engine bay.
- Position the new alternator and loosely install the mounting bolts.
- Reconnect the wiring harness and output cable.
- Install and tension the serpentine belt according to your engine's specifications.
- Tighten the alternator pivot and adjusting bolts.
- Reconnect the battery's negative terminal.
- Start the engine and verify the charging system is operating correctly.
Troubleshooting & FAQ
How do I confirm this alternator fits my engine?
The best way is to match the part number from your old alternator to the numbers in our Part Number Matrix. Additionally, verify your engine model and year are listed in the compatibility tables.
Why is the amperage listed as a range (55-65A)?
Different aftermarket manufacturers and data sources list slightly different specifications for the same cross-referenced part. This unit will perform reliably within this common output range for the specified applications.
What are the signs of a failing alternator?
Common symptoms include dimming dashboard lights or headlights, a battery warning light on the dash, a weak or dead battery, or a whining/grinding noise coming from the engine bay.
My boat's model isn't listed, but the part number matches. Will it fit?
If the part number on your original alternator is listed in our Part Number Matrix, it is highly likely to be a correct fit. Engine manufacturers often use the same components across many different boat models.
What is the difference between this aftermarket part and an OEM part?
This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component. It is designed and built to meet or exceed OEM specifications using comparable materials. It offers a cost-effective solution without sacrificing performance or reliability.
How fast is shipping?
We ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free for most regions, with expedited options available at checkout where applicable.
What is the warranty and return policy?
This product is covered by a 2-year warranty against manufacturing defects under normal marine use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window if the part is unused and in its original packaging.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an OEM component.
- Professional installation is highly recommended for safety and optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
Payment & Security
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