ARCO Marine Zeus A275L J-180 4" Alternator w/Terminal Block

The Zeus A275L J-180 4" Alternator with Terminal Block is a top-of-the-line marine alternator engineered to provide maximum power output and exceptional reliability for your boating and marine electrical systems. Whether you're outfitting a yacht, fishing boat, or recreational vessel, this alternator ensures efficient energy production and optimal performance in all marine environments.

Features

• Engineered for high energy production, ensuring your marine electrical systems receive ample power.
• Versatile application suitability for marine, RV, military, and commercial uses.
• Rapidly charges large battery banks, keeping your onboard systems running smoothly.
• Operates at the coolest temperatures to enhance performance and longevity.
• Runs 8-20% cooler than standard alternators thanks to advanced heat-shedding coatings, an external housing refrigerator, dual cooling fans, and OEM components.
• Optimized for performance at idle engine speeds, ideal for marine vessels that often idle.
• Reduces dependence on generators by generating additional power directly from your engine.
• Enhanced with E-Coat/Cerakote coatings, absorbing less heat and allowing for sustained amperage output.
• Compatible with ARCO Zeus Bluetooth alternator regulators or lithium battery charging systems for maximum performance.
• SAE J1171 certified, ensuring compliance with industry standards.
• Proudly manufactured in the U.S.A., guaranteeing quality and craftsmanship.

Technical Specifications

Specification	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 an 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, w/ 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 Application

• Directly replaces most Volvo Penta alternators using a 4” J180 saddle-style mount, ensuring easy installation on compatible marine engines.

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.