ARCO Marine Zeus A275L 3.15 in. Alternator with Isolated Ground and Terminal Block

The ARCO Marine Zeus A275L 3.15 in. alternator is designed for high-energy production across marine, RV, military, and commercial applications. This unit is built to charge large battery banks efficiently, featuring dual cooling fans, heat-shedding E-coat or Cerakote finishes, and an exterior-mounted rectifier for cooler operating temperatures.

Key Features:

• Optimized performance at idle speeds
• SAE J1171 certified
• Made in the U.S.A.
• Compatible with the ARCO Zeus Bluetooth Alternator Regulator for lithium charging
• Dual cooling fans and exterior rectifier design

Technical Specifications:

• Voltage: 12V
• Max Output: 311 Amps (Cold, 9,000 RPM)
• Sustained Idle Output: 198 Amps (Hot, 3,000 RPM)
• Regulation: Internal with adapter for external regulation
• Weight: 14.9 lbs
• Mount: 3.15 in. saddle style
• Pulley: 49K6 (6-groove, 49mm)
• Max Continuous Operating Temperature: 230°F

Fitment Note: This alternator replaces most small case styles using a 3.15 in. saddle mount, such as those found on Hitachi, Lucas, Mitsubishi, and most Yanmar systems. Installation requires upgrading standard single V-belts to a serpentine system.