Alternator 12V 50A – Fits Mercruiser/Cummins CMD 1.7L Marine Engines (Replaces 882571, 8M0084523)
Alternator 12V 50A – Fits Mercruiser/Cummins CMD 1.7L Marine Engines (Replaces 882571, 8M0084523) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
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 12V 50A – Fits Mercruiser/Cummins CMD 1.7L Marine Engine...
Product Details
This is a direct-fit aftermarket Alternator 12V 50A – Fits Mercruiser/Cummins CMD 1.7L Marine Engines (Replaces 882571, 8M0084523). It is designed for Mercruiser/Cummins CMD 1.7 MI 120 L/L4 and CMD 1.7 MS 120 L/L4 diesel marine engines (120 HP, 4-Stroke) manufactured between 2004–2005.
It provides a reliable power source, serving as a direct interchange for Mercruiser, Cummins, Mitsubishi, Isuzu, and Lucas Electric part numbers.
- Installation: Direct OEM-style fit and connection.
- Environment: Built for marine conditions.
- Inclusions: Includes the alternator unit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercruiser | 882571 / 8M0084523 |
| Cummins | 882571 / 8M0084523 |
| Mitsubishi | A7TA2991 |
| Isuzu | 8972477180 |
| Lucas Electric | LRA02960 |
| Kubota | 8-97247-718-0 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This alternator fits specific Mercruiser sterndrive diesel engines based on the Isuzu 1.7L platform.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercruiser | CMD 1.7 MI 120 L/L4 | 120 | 4-Stroke | 2004–2005 | 882571/8M0084523 | Diesel Engine |
| Mercruiser | CMD 1.7 MS 120 L/L4 | 120 | 4-Stroke | 2004–2005 | 882571/8M0084523 | Diesel Engine |
| Mercruiser | D1.7L DTI (Alpha) | 120 | 4-Stroke | 2004–2005 | 882571/8M0084523 | Isuzu 1.7L - 103ci - 4cyl |
Technical Specs
- Product Type
- Marine Alternator
- Installation
- Direct OEM Replacement
- Voltage
- 12V
- Amperage
- 50A
- Connection
- Standard Marine Connections
- Housing Material
- Metal
- Housing Color
- Silver/Metal
- Product Dimensions
- 23.0 cm (L) x 20.0 cm (W) x 20.0 cm (H)
- Pulley Type
- Solid
- Pulley Size
- 6 Groove (50 mm)
- Regulator Clock Position
- 10:30
- Mount Hole ID 1
- 8.2 mm Unthreaded
- Mount Hole ID 3
- 10.2 mm Unthreaded
- Fan Location
- Internal
- Regulator Location
- Internal
- Terminal ID 2
- B+ M5x0.8
- Polarity
- Negative
What’s in the Box
- 1 x Alternator (882571/8M0084523)
Installation Notes
- Disconnect the negative terminal from your boat's battery.
- Loosen the drive belt tensioner and remove the belt from the alternator pulley.
- Identify and disconnect the electrical wires from the back of the old alternator, noting their positions.
- Remove the mounting bolts securing the alternator to the engine block.
- Carefully lift the old alternator out.
- Position the new alternator and secure it with the original mounting bolts.
- Reconnect the electrical connections to the appropriate terminals.
- Reinstall the drive belt and apply correct tension.
- Reconnect the battery's negative terminal.
- Start the engine and check the voltmeter to ensure the new alternator is charging correctly (typically 13.8–14.5V).
Troubleshooting & FAQ
How do I confirm this alternator fits my engine?
Check your engine model and year against our compatibility table. The easiest way is to match the part number from your old alternator to one of the cross-reference numbers listed in the Part Number Matrix.
What are the signs of a failing alternator?
Common symptoms include dimming lights, a "Check Battery" or "ALT" warning on your dashboard, a weak or dead battery, a whining noise from the engine, or a burning smell from the alternator itself. A multimeter reading below 13V at the battery while the engine is running also indicates a charging issue.
How does this part differ from the original OEM component?
This is an aftermarket part designed to meet or exceed OEM specifications for fit, form, and function. It uses comparable materials and manufacturing processes but is available at a more competitive price point.
Is any special maintenance required for this alternator?
No special maintenance is needed. However, ensure the drive belt is kept at the proper tension and that all electrical connections remain clean and tight. Periodically inspect for any signs of corrosion or wear.
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
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
