ARCO Marine Zeus A275L J-180 3.15" Alternator w/Terminal Block

The Zeus A275L J-180 3.15" Alternator with Terminal Block is engineered to deliver the highest power output in its class, making it an ideal choice for marine and boating applications. Whether you're outfitting your vessel for long voyages or ensuring reliable power for your onboard systems, the A275L provides robust performance and exceptional durability.

Key Features

• High Energy Production: Designed to meet the demanding power needs of marine environments.
• Versatile Applications: Perfect for marine, RV, military, and commercial uses.
• Rapid Charging: Efficiently charges large battery banks, minimizing downtime.
• Enhanced Cooling: Operates 8-20% cooler than standard alternators thanks to:
  • Heat-shedding coatings
  • Rectifier located on the housing exterior
  • Dual cooling fans
  • OEM-quality components
• Optimized Idle Performance: Maintains high performance even at low engine speeds.
• Generator Reduction: Generates additional power from your engine, reducing the need for a separate generator.
• Advanced Coating: E-Coat/Cerakote finishes absorb less heat, enabling more sustained amperage output.
• Smart Regulation: Compatible with ARCO Zeus Bluetooth alternator regulators for maximum efficiency and lithium battery charging.
• SAE J1171 Certified: Meets rigorous industry standards for reliability and performance.
• Made in the USA: Quality craftsmanship and materials sourced domestically.

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 external regulator such as ARCO Zeus Bluetooth)
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 Applications

The Zeus A275L J-180 is designed to replace most small case styles using a 3.15" J180 saddle mount. It is compatible with brands such as Hitachi, Lucas, Mitsubishi, and most Yanmars, ensuring a straightforward installation process for your marine engine setup.

Why Choose the Zeus A275L J-180 Alternator?

Choosing the Zeus A275L means investing in an alternator that offers superior cooling, high amperage output, and reliability essential for marine environments. Its advanced features not only enhance performance but also extend the lifespan of your electrical system by maintaining optimal operating temperatures and providing consistent power delivery.

Note: This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.

Quick Guide (PDF)
Brochure (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.