Alternator – Fits Mercruiser/Volvo Penta CMD QSD 2.0/2.8 & 4.2 Diesel Engines (Replaces 69729, 898101505)
Alternator – Fits Mercruiser/Volvo Penta CMD QSD 2.0/2.8 & 4.2 Diesel Engines (Replaces 69729, 898101505) 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 Mercruiser/Volvo Penta CMD QSD 2.0/2.8 & 4.2 ...
Product Details
This high-output Alternator fits Mercruiser/Volvo Penta CMD QSD 2.0/2.8 & 4.2 Diesel Engines, covering a wide range of models from the 2000s–2010s with horsepower ratings from 115 to 350 HP. It is engineered to keep your marine diesel engine's charging system performing reliably.
This unit serves as a direct cross-reference for numerous OEM and aftermarket part numbers, including Mercruiser 69729, Volvo Penta 3857298, and Pleasurecraft RA097002.
- Designed for simple, direct OEM-style replacement.
- Features a 12V self-exciting regulator with an output between 68A and 110A, depending on the application.
- Equipped with a single pulley, though some variations for specific models may include a multi-groove serpentine pulley.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercruiser | 37615 |
| Mercruiser | 37615A1 |
| Mercruiser | 47456A1 |
| Mercruiser | 56045 |
| Mercruiser | 59755 |
| Mercruiser | 69729 |
| Mercruiser | 78403A1 |
| Mercruiser | 78477 |
| Mercruiser | 817119A4 |
| Mercruiser | 90794 |
| Volvo Penta | 3853853 |
| Volvo Penta | 3857298 |
| Pleasurecraft | RA097002 |
| Pleasurecraft | RA097003 |
| Pleasurecraft | RA097006 |
| Pleasurecraft | RK097003 |
| Bombardier | 0988247 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercruiser | CMD QSD 2.0 EI 115 | 115 | 4-Stroke | 69729 | 2.0L I4 Diesel |
| Mercruiser | CMD QSD 2.0 EI 130 | 130 | 4-Stroke | 69729 | 2.0L I4 Diesel |
| Mercruiser | CMD QSD 2.0 ES 130 | 130 | 4-Stroke | 69729 | 2.0L I4 Diesel |
| Mercruiser | CMD QSD 2.0 EI 150 | 150 | 4-Stroke | 69729 | 2.0L I4 Diesel |
| Mercruiser | CMD QSD 2.0 ES 150 | 150 | 4-Stroke | 69729 | 2.0L I4 Diesel |
| Mercruiser | CMD QSD 2.0 EI 170 | 170 | 4-Stroke | 69729 | 2.0L I4 Diesel |
| Mercruiser | CMD QSD 2.0 ES 170 | 170 | 4-Stroke | 69729 | 2.0L I4 Diesel |
| Mercruiser | CMD QSD 2.8 EI 170 | 170 | 4-Stroke | 69729 | |
| Mercruiser | CMD QSD 2.8 ES 210 | 210 | 4-Stroke | 69729 | |
| Mercruiser | CMD QSD 2.8 ES 220 | 220 | 4-Stroke | 69729 | |
| Mercruiser | CMD QSD 2.8 ES 230 | 230 | 4-Stroke | 69729 | |
| Mercruiser | CMD QSD 4.2 EI 320 | 320 | 4-Stroke | 69729 | |
| Mercruiser | CMD QSD 4.2 ES 270 | 270 | 4-Stroke | 69729 | |
| Mercruiser | CMD QSD 4.2 ES 350 | 350 | 4-Stroke | 69729 |
Technical Specs
- Product Type
- Marine Engine Alternator
- Installation
- Direct OEM Replacement
- Output
- 12V Self-exciting, 68A-110A depending on model
- Housing Material
- Metal
- Dimensions
- Height: 205 mm, Width: 185 mm, Length: 190 mm
- Weight
- 5.59 kg (12.32 lbs)
- Pulley Type
- Single (some models include Multi-groove Serpentine Pulley)
- Drive
- Flywheel Drive Pulley
What’s in the Box
- 1 x Alternator (69729/898101505)
Installation Notes
- Disconnect the boat's battery at the negative terminal before beginning work.
- Identify and carefully disconnect the existing alternator's electrical connections.
- Loosen the belt tensioner and remove the drive belt from the alternator pulley.
- Remove the mounting bolts securing the old alternator and lift it from the engine.
- Visually compare the new alternator with the old unit to confirm fitment and pulley alignment.
- Position the new alternator and secure it with the original mounting bolts. Do not overtighten.
- Reinstall the drive belt and apply the correct tension as per your engine's service manual.
- Reconnect the electrical wiring to the appropriate terminals on the new alternator.
- Reconnect the battery's negative terminal.
- Start the engine and use a multimeter to verify correct voltage output (typically 13.8V-14.5V) at the battery.
Troubleshooting & FAQ
How do I know this alternator is the correct one for my engine?
First, check your engine model against our 'Engine & Model Compatibility' list. Second, use the 'Part Number Matrix' to see if your old alternator's part number is listed as a direct replacement. Finally, always compare the product photos to your physical part to ensure a match.
What are the signs of a failing alternator?
Common symptoms include dimming dashboard or cabin lights, a battery warning light on your helm gauges, a weak or dead battery that won’t hold a charge, or a grinding/whining noise coming from the alternator itself.
The output is listed as a range (68A-110A). Which amperage will I get?
This alternator is designed to work with all the diesel engines listed. The internal voltage regulator will automatically supply the amperage required by your specific engine's electrical system, up to the alternator's maximum capacity.
Will I need to modify anything for installation?
No, this is a drop-in replacement. It is designed to match the OEM unit's dimensions, mounting points, and electrical connections. No modification should be necessary.
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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