ARCO Marine Zeus A275L 1"-2" Single Foot Alternator w/Terminal Block

The Zeus A275L 1"-2" Single Foot Alternator is the ultimate power solution for marine and boating applications. Designed to deliver exceptional energy output and operate efficiently in demanding environments, this alternator ensures your vessel's electrical systems perform reliably under all conditions.

Key Features

• High Energy Production: Engineered to deliver the highest power output in its class, ensuring ample energy for all your marine needs.
• Versatile Applications: Perfect for marine, RV, military, and commercial use, adapting seamlessly to various power requirements.
• Fast Battery Charging: Rapidly charges large battery banks, keeping your onboard systems powered and ready.
• Superior Cooling: Operates 8-20% cooler than standard alternators thanks to advanced heat-shedding coatings, an external rectifier, dual cooling fans, and OEM-grade components.
• Optimized for Idle: Maintains high performance even at idle speeds, ideal for vessels that spend extended periods at low RPMs.
• Generator Alternative: Reduces reliance on generators by generating additional power directly from your engine.
• Durable Coating: Features E-Coat/Cerakote finishes that absorb less heat, allowing for sustained amperage and longer operational life.
• Advanced Regulation: Compatible with ARCO Zeus Bluetooth alternator regulators and lithium battery charging systems for maximum efficiency.
• Certified Quality: SAE J1171 Certified, meeting strict industry standards for reliability and performance.
• Made in the USA: Proudly manufactured in the United States, ensuring top-tier quality and support.

Technical Specifications

Parameter	Details
Voltage	12V
Field Type	P
Rotor Poles	16
Stator Size	138mm
Frame Size	Large
Weight	14.9 lbs / 6.7 kg
Regulation	External Only (Includes terminal block and P-Type harness. Requires external regulator such as ARCO Zeus Bluetooth alternator regulator.)
Output Voltage	14.1V (Default)
Finish	Black Cerakote or E-coating
Cut-In RPM	1,061 Alternator RPM
Maximum Alternator RPM	19,000
Battery Post	M8 Thread Post, Side Mount
Standard Pulley	49K6 (6-groove, 49mm)
Pulley Mount	17mm diameter shaft, 25mm long, threaded M17 x 1.5
Pulley Hardware	M17 x 1.5 x 24mm nut, with 18mm ID x 29mm OD washer (Included)
Diodes	6 positive, 6 negative, 50A Rated, Avalanche
Max Output (Cold, 9,000 RPM)	311 Amps
Sustained Cruising Output (Hot, 6,000 RPM)	227 Amps
Sustained Idle Output (Hot, 3,000 RPM)	198 Amps
Max Continuous Operating Temperature	110°C / 230°F

Mounting Compatibility

• Designed to replace most domestic alternators with a single 1” or 2” mounting foot, including brands like Motorola and Prestolite.

Download the Quick Guide (PDF)

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.