Alternator (55A 12V) – Fits Volvo Penta, MerCruiser, OMC 3.0L-9.4L Marine Engines (Replaces 3860769, 817119A4)
Alternator (55A 12V) – Fits Volvo Penta, MerCruiser, OMC 3.0L-9.4L Marine Engines (Replaces 3860769, 817119A4) 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
Free standard shipping on all orders under 1 KG
Alternator (55A 12V) – Fits Volvo Penta, MerCruiser, OMC 3.0L-9.4L ...
Product Details
This Alternator (55A 12V) – Fits Volvo Penta, MerCruiser, OMC 3.0L-9.4L Marine Engines is a direct replacement for 55 Amp, 12-Volt marine alternators used in a wide range of gasoline engines from the late 1980s through the early 2000s. It is compatible with Volvo Penta (1993–1999), MerCruiser (1987–2001), and OMC (1993–1996) models, featuring an internal regulator and single groove pulley.
This unit directly replaces Volvo Penta 3860769/3854809, Mercury 817119A4/817119A1/12449/19685, OMC 3854809/3860769, and Pleasurecraft Marine RA097006.
- Engineered for direct bolt-on installation.
- SAE J1171 certified for marine use, ensuring ignition protection.
- Features a reliable, self-exciting internal voltage regulator.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3860769 |
| Volvo Penta | 3854809 |
| Mercury | 817119A4 |
| Mercury | 817119A1 |
| Mercury | 12449 |
| Mercury | 19685 |
| OMC | 3854809 |
| OMC | 3860769 |
| Pleasurecraft Marine | RA097006 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
MerCruiser Applications: Fits various 4-cylinder, V6, and V8 inboard, sterndrive, and ski engines manufactured between 1987 and 2001.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 3.0 / 3.0LX | 115-135 | 4-Stroke | 1987–1995 | 817119A4 | GM 181ci 3.0L |
| MerCruiser | 175 / 185 / 205 | 140-205 | 4-Stroke | 1987–1992 | 817119A4 | GM 262ci 4.3L V6 |
| MerCruiser | 4.3L (2-BBL) | 180 | 4-Stroke | 1988–1992 | 817119A4 | GM 262ci V6 |
| MerCruiser | 4.3LX (4-BBL) | 205 | 4-Stroke | 1988–1992 | 817119A4 | GM 262ci V6 |
| MerCruiser | 4.3L (Gen II) | 180-205 | 4-Stroke | 1992–1996 | 817119A4 | GM 262ci V6 |
| MerCruiser | 200 / 230 | 200-230 | 4-Stroke | 1987 | 817119A4 | GM 305ci 5.0L V8 |
| MerCruiser | 5.0L (4-BBL) | 205 | 4-Stroke | 1987–1995 | 817119A4 | GM 305ci V8 |
| MerCruiser | 5.0LX | 205-230 | 4-Stroke | 1988–1995 | 817119A4 | GM 305ci V8 |
| MerCruiser | 230 MIE | 230 | 4-Stroke | 1981–1995 | 817119A4 | GM 305ci 5.0L V8 Inboard |
| MerCruiser | 260 | 260 | 4-Stroke | 1987 | 817119A4 | GM 350ci 5.7L V8 |
| MerCruiser | 260 MIE | 260 | 4-Stroke | 1981–1987 | 817119A4 | GM 350ci 5.7L V8 Inboard |
| MerCruiser | 350 Mag Alpha | 255 | 4-Stroke | 1988–1995 | 817119A4 | GM 350ci 5.7L V8 |
| MerCruiser | 350 Mag Ski | 255 | 4-Stroke | 1991–1996 | 817119A4 | GM 350ci 5.7L V8 |
| MerCruiser | 5.7L Bravo | 255-260 | 4-Stroke | 1988–1995 | 817119A4 | GM 350ci V8 |
| MerCruiser | 5.7L Competition Ski | 260-275 | 4-Stroke | 1987–1996 | 817119A4 | GM 350ci 5.7L V8 |
| MerCruiser | 5.7L MIE | 260 | 4-Stroke | 1988–1996 | 817119A4 | GM 350ci 5.7L V8 Inboard |
| MerCruiser | 420 | 330 | 4-Stroke | 1987–1989 | 817119A4 | GM 454ci 7.4L V8 |
| MerCruiser | 425 / 450 (Gen V) | 330-385 | 4-Stroke | 1992–1996 | 817119A4 | GM 454ci 7.4L V8 |
| MerCruiser | 454 Mag Bravo | 330-385 | 4-Stroke | 1988–1994 | 817119A4 | GM 454ci 7.4L V8 |
| MerCruiser | 7.4L Bravo (Gen V) | 330-385 | 4-Stroke | 1992–1996 | 817119A4 | GM 454ci V8 |
| MerCruiser | 7.4L MIE (LH) (Gen V) | 330 | 4-Stroke | 1992–1996 | 817119A4 | GM 454ci 7.4L V8 Inboard |
| MerCruiser | 465 / 465 (Gen V) | 465 | 4-Stroke | 1990–1994 | 817119A4 | GM 502ci 8.2L V8 |
| MerCruiser | 500 (Gen V/VI/+) | 415 | 4-Stroke | 1994–2000 | 817119A4 | GM 502ci 8.2L V8 |
| MerCruiser | 500 Bulldog | 500 | 4-Stroke | 1990–2001 | 817119A4 | GM 540ci 8.9L V8 |
| MerCruiser | 502 Mag Bravo (Gen V) | 415 | 4-Stroke | 1992–1993 | 817119A4 | GM 502ci 8.2L V8 |
| MerCruiser | 8.2L MIE (Gen V) | 415 | 4-Stroke | 1993–1996 | 817119A4 | GM 502ci 8.2L V8 Inboard |
| MerCruiser | 525SC (Gen V/VI) | 525 | 4-Stroke | 1991–1996 | 817119A4 | GM 454ci 7.4L V8 |
| MerCruiser | 600SC (Gen IV/V/VI) | 600 | 4-Stroke | 1991–1998 | 817119A4 | GM 502ci 8.2L V8 |
| MerCruiser | 800SC (Gen V) | 800 | 4-Stroke | 1993–1998 | 817119A4 | GM 472ci 9.4L V8 |
Volvo Penta Applications: Compatible with 4-cylinder, 6-cylinder, and V8 gasoline engines from 1993 to 1999.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 3.0GL / 3.0GS | 130-135 | 4-Stroke | 1993–1999 | 3860769 | 4cyl, 181ci, 3.0L Gas |
| Volvo Penta | 4.3Gi / 4.3GL / 4.3GS | 190-225 | 4-Stroke | 1993–1999 | 3860769 | 6cyl, 262ci, 4.3L Gas |
| Volvo Penta | 5.0Fi / 5.0FL | 200-220 | 4-Stroke | 1993–1999 | 3860769 | 8cyl, 302ci, 5.0L Ford |
| Volvo Penta | 5.7Gi / 5.7GL / 5.7GS / 5.7GSi | 255-300 | 4-Stroke | 1993–1999 | 3860769 | 8cyl, 350ci, 5.7L Gas |
| Volvo Penta | 5.8Fi / 5.8L | 230-275 | 4-Stroke | 1993–1996 | 3860769 | 8cyl, 351ci, 5.8L Gas |
| Volvo Penta | 7.4GL | 300-330 | 4-Stroke | 1994–1999 | 3860769 | 8cyl, 454ci, 7.4L Gas |
| Volvo Penta | 8.2GL | 380-420 | 4-Stroke | 1994–1999 | 3860769 | 8cyl, 502ci, 8.2L Gas |
OMC Applications: For 4-cylinder, V6, and V8 inboard & V-drive engines from model years 1993 to 1996.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| OMC | INBOARD & V-DRIVE | 115-135 | 4-Stroke | 1994–1996 | 3854809/3860769 | 3.0L 4-cylinder |
| OMC | INBOARD & V-DRIVE | 190-205 | 4-Stroke | 1994–1996 | 3854809/3860769 | 4.3L V6 |
| OMC | INBOARD & V-DRIVE | 200-260 | 4-Stroke | 1993–1996 | 3854809/3860769 | 5.0L/5.8L Ford V8 |
| OMC | INBOARD & V-DRIVE | 255-300 | 4-Stroke | 1994–1996 | 3854809/3860769 | 5.7L GM V8 |
| OMC | INBOARD & V-DRIVE | 330-380 | 4-Stroke | 1993–1996 | 3854809/3860769 | 7.4L GM V8 |
Technical Specs
- Product Type
- Marine Alternator
- Installation
- Direct Bolt-on
- Amperage
- 55 Amps
- Voltage
- 12 Volts
- Rotation
- Bi-directional
- Regulator
- Internal
- Pulley Type
- Single Groove
- Mounting Type
- Engine Mount
- Housing Material
- Machined Aluminum
- Dimensions
- 21.0cm L x 19.0cm W x 18.0cm H
- Weight
- 12.1 pounds (5.5 kg)
- Mounting Hole Type
- 1 Threaded, 1 Unthreaded
- Mounting Hole ID
- 5/16" Threaded
- Terminal Configuration
- B+
- Terminal Size
- 1/4"
- Polarity
- Negative
- Safety Rating
- Marine SAE J1171
- Warranty
- 1 Year
What’s in the Box
- 1 x Marine Alternator (817119A4/3860769)
Installation Notes
- Disconnect the battery terminals to prevent electrical shorts.
- Loosen the alternator belt tensioner and remove the serpentine belt.
- Disconnect the main power lead and wiring harness plug from the old alternator.
- Remove the mounting bolts securing the alternator and carefully lift it out of the engine bay.
- Install the new alternator, ensuring mounting brackets align. Securely tighten the bolts.
- Reconnect the wiring harness and B+ terminal.
- Reinstall the belt, ensuring proper tension, and reconnect the battery. Start the engine and verify charging voltage (typically 13.8–14.5V).
Troubleshooting & FAQ
How do I confirm this alternator fits my engine?
Check your original part number against the references in our Part Number Matrix. Also, use the Engine & Model Compatibility tables to verify your specific engine model and year range are listed.
What are common signs of a failing marine alternator?
Common symptoms include dimming lights, a weak or dead battery that won't hold a charge, a "Check Engine" or battery warning light on the dashboard, and a whining or grinding noise coming from the alternator.
Is this a direct bolt-on part?
Yes, this alternator is designed for direct bolt-on installation, using the factory mounting points and electrical connections for the specified engine models.
Does this alternator require an external voltage regulator?
No, it features a modern internal regulator, simplifying installation and providing reliable voltage control.
Is there a break-in period for a new alternator?
No formal break-in period is required. Once installed and tensioned correctly, it should operate at full capacity immediately. Monitor its performance on the first couple of trips to ensure everything is functioning correctly.
How do I know if my alternator or battery is the problem?
A simple test is to jump-start the engine and then disconnect the jumper cables. If the engine dies immediately, the alternator is likely the culprit. If it continues to run, the battery may not be holding a charge and should be tested.
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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