61A Alternator – Fits Volvo Penta D1-D6 Marine Engines (Replaces 841769, 858839)

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Product Details

This 61A Alternator is designed for Volvo Penta D1, D2, D4, and D6 series marine diesel engines, providing reliable 12V electrical power generation for your boat's systems.

It serves as a direct aftermarket replacement for Volvo Penta part numbers 841769, 858839, 841762, and Champion MA23.

Designed for direct OEM replacement installation.
Provides a stable 61 Amp output.
Features a 6-groove pulley and an internal regulator.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Volvo Penta	841769
Volvo Penta	858839
Volvo Penta	841762
Champion	MA23

Engine & Model Compatibility

Confirm your engine model and year in the table below.

For Volvo Penta owners, this alternator fits a range of D-series engines. Please verify your specific model and original part number before ordering.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Volvo Penta	D1-30	30	4-Stroke	2005+	841769	Including B, F variants
Volvo Penta	D2-40	40	4-Stroke	2005+	841769	Including B, F variants
Volvo Penta	D2-55	55	4-Stroke	2001+	841769	Including C, D, E, F variants
Volvo Penta	D2-75	75	4-Stroke	2003+	841769	Including B, C, F variants

Technical Specs

Product Type: Marine Engine Alternator
Installation: Direct OEM Replacement
Output: 61A (61 Amps)
Voltage: 12V
Pulley Type: 6 Groove
Pulley Size: 50 mm (6 rib)
Rotation: CW (Clockwise)
Dimensions: 180 mm H x 185 mm W x 205 mm L
Weight: 4.78 kg (10.54 lbs)
Regulator: Internal
Warranty: 1 Year (varies by retailer)

What’s in the Box

1 x Alternator (841769)

Installation Notes

Disconnect the battery terminals to prevent electrical shorts.
Loosen the serpentine belt tensioner and remove the belt from the alternator pulley.
Carefully disconnect the main power lead and wiring harness from the back of the old alternator.
Remove the mounting bolts securing the old alternator and lift it from the engine.
Position the new alternator and secure it with the original mounting bolts. Do not overtighten.
Reconnect the power lead and wiring harness to the new unit.
Reinstall the serpentine belt, ensuring it is properly seated on all pulleys.
Apply tension to the belt according to your engine's service manual specifications.
Reconnect the battery terminals (positive first, then negative).
Start the engine and verify the alternator is charging correctly using a voltmeter.

Troubleshooting & FAQ

How do I know if this alternator fits my engine?

This alternator is designed for Volvo Penta D1, D2, D4, and D6 series engines. The best way to confirm fitment is to match your original part number to the references listed in our Part Number Matrix, such as 841769, 858839, or 841762. Also, check the compatibility table and compare the technical specs to your current unit.

The input data mentions a 115A alternator. Which one is this?

This product is the 61A version. Some engine models may have had different alternator options from the factory (e.g., a standard 61A and a higher-output 115A). This part replaces the 61A OEM unit. If your system has high electrical demands, you may need a higher-amperage alternator, but you must ensure it is compatible with your engine's mounting and wiring.

What are the signs of a failing alternator?

Common symptoms include dimming lights, a warning light on the dashboard (often a battery icon), a weak or dead battery, slow-cranking engine, or a whining/grinding noise coming from the alternator itself.

Is any special wiring required for installation?

No. This alternator is designed as a direct-fit replacement and should connect to your existing factory wiring harness without modification.

What is the typical replacement interval for a marine alternator?

The lifespan of a marine alternator can vary greatly depending on usage, operating environment (saltwater vs. freshwater), and electrical load. There is no fixed interval, but they are typically replaced when they show signs of failure. Regular inspection of the belt and connections is recommended.

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.

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