ARCO Marine Zeus A275L J-180 4 in. Alternator with Terminal Block

The ARCO Marine Zeus A275L J-180 4 in. Alternator is engineered for high-energy production across marine, RV, military, and commercial applications. Designed to charge large battery banks efficiently, this unit features heat-shedding Cerakote and E-Coat finishes, dual cooling fans, and advanced thermal management to operate 8 to 20% cooler than standard alternators. Optimized for high performance at idle, this unit helps reduce generator dependency.

Key Features and Specifications:

• Voltage: 12v
• Maximum 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
• Mounting: J-180 4 in. saddle-style (replaces most Volvo Penta alternators)
• Regulation: External only (includes terminal block and P-Type harness; requires external regulator such as ARCO Zeus Bluetooth)
• Operating Temperature: Up to 110°C (230°F)
• Standard Pulley: 49K6 (6-groove, 49mm)
• Weight: 14.9 lbs
• SAE J1171 certified
• Made in the U.S.A.

Each unit includes pulley mounting hardware (M17 x 1.5 x 24mm nut and 18mm ID x 29mm OD washer). Requires an external regulator for operation.