Home Products

ATG10061 Alternator 101211-3020 821663-1 821663-A1 for Mercury Marine 225CXL 225CXXL 225L EFI Outboard Engine

3 Reviews

Add Your Review

US$143.00

ITEMNO： ATG10061

IN STOCK

BUY NOW ADD TO CART

Good Packaging

Safe Payment

100k+ Customers Top Choice

1 Year Warranty

90-Day Return

24/7 Service

TAGS：

Product Details Product Highlights Shipping

PRODUCT DETAILS

ATG10061 Alternator 101211-3020 821663-1 821663-A1 12358N for Mercury Marine 225 250 300 EFI Optimax Outboard Engine 12V 50A IR Generator

Part Numbers:
101211-3020, 821663-1, 821663-A1, 12358, 12358N, 400-52198, ND101211-3021, ATG10061

Product Description

The ATG10061 Alternator is a high-performance aftermarket replacement designed for Mercury Marine and Mariner outboard engines, including 225HP, 250HP, and 300HP EFI / Optimax / SeaPro series. Built to meet or exceed Denso OEM specifications, this 12V 50A alternator delivers stable charging output and reliable electrical performance in demanding marine environments.

Engineered with an internal regulator (IR) and 1V pulley design, this unit ensures accurate voltage control, smooth operation, and long service life. It is a direct-fit replacement for multiple OEM and aftermarket part numbers used across Mercury Marine V6 and V8 outboard platforms.

Specifications

Specification	Details
Product Type	Alternator
Model	ATG10061
Condition	Aftermarket Part
Voltage	12V
Amperage	50A
Rotation	CW (Clockwise)
Regulator	Internal Regulator (IR)
Pulley Type	1V Pulley
Unit Type	Denso
Weight	4.0 kg

OEM & Cross Reference

Brand	Part Number
Denso	101211-3020
Denso	101211-3021
Mercury Marine	821663
Mercury Marine	821663-1
Mercury Marine	821663-A1
Lester	12358
WAI	12358N
Arrowhead	400-52198
Arrowhead	ND101211-3021
API Marine	20300
Cargo	112491
Sierra Marine	18-6449
EMP Parts	4-6449

Fitment

Make	Type	Model	Year	Engine
Mercury	Outboard	225 CXL / CXXL / XL / XXL EFI	1994–2000	225HP
Mariner	Outboard	225 EFI / Carb / SeaPro	All Years	GM 3.0L 183ci
Mercury	Outboard	250 EFI Series	1995–2000	250HP
Mercury	Outboard	300 Promax Racing Series	1998–2000	300HP

PRODUCT HIGHLIGHTS

Feature	Benefit
50A Stable Output	Reliable charging for high-performance marine engines
Denso OEM Design	Direct replacement with factory compatibility
1V Pulley System	Ensures correct belt engagement and smooth operation
Marine-Grade Durability	Built for saltwater and offshore environments

SHIPPING

Item Details

Processing Time Orders are processed within 1-3 business days after payment confirmation

Shipping Methods DHL/UPS/ FedEx/ TNT/ Air Freight/ Sea Freight

Estimated Delivery Time Express shipping: 3-7 business days, depending on destination

Packaging Export-standard cartons with protective inner packing

Tracking Tracking number will be provided once the order is shipped

Shipping Cost Calculated based on weight, dimensions, and destination

Need Help?

Our product experts will respond to your email within 24 business hours.

Question *

Name *

Email *

Verification code *

WARRANTY POLICY

All new aftermarket parts come with a 1-Year warranty. Quality is the first thing we consider. Check out our Warranty Assistance for more details.

SHIPPING POLICY

We offer express and standard shipping options to ensure your off-road machine gets back in action—fast and reliably. For more details, please visit our Shipping Policy .

EASY RETURN POLICY

We prioritize your satisfaction. If your order doesn't meet your expectations within 90 days, you may be eligible for a refund. See our Easy Return Policy for details.

PRODUCT RECOMMENDATION