ARCO Marine Zeus A275L Vortec Alternator with Regulator for Marine and Heavy-Duty Applications

Zeus A275L Vortec Alternator with Regulator

The highest power output alternator in its size/class.

Features:

• Engineered for High Energy Production.
• Suitable for Marine, RV, Military, and Commercial applications.
• Rapidly charges large battery banks.
• Coolest operating temperatures for increased performance.
• Runs 8 - 20% cooler than incumbent alternators due to: Heat shedding coatings, Rectifier located on housing exterior, Dual cooling fans, and OEM Components.
• It is optimized for performance at idle speeds.
• Reduces the need for a generator by creating additional power with your engine.
• Unleash peak performance with E-Coat/Cerakote. Our advanced coating absorbs less heat, keeping the A275L cooler. This translates to more amperage for sustained periods.
• Use an ARCO Zeus Bluetooth alternator regulator or lithium battery charging for maximum performance.
• SAE J1171 Certified.
• Made in the U.S.A.

Technical Specifications:

• Voltage - 12v
• Field Type - P
• Rotor Poles - 16
• Stator Size - 138mm
• Frame Size - Large
• Weight - 14.9 lbs/6.7 kg
• Regulation - Internal/External (Internally regulated with adaptor for optional external regulation.)
• Output Voltage - 14.1v (Default)
• Finish - (Black) Cerakote or E-coating
• Cut-In RPM - 1,061 Alternator RPM
• Maximum Alt 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 - 110C / 230F

Mounting Application:

• Replaces Mando-type alternators using Vortec/GM pad mounting feet. (Found on many Mercruiser and Volvo Penta 3.0GLM, 3.0GLP, 4.3GXi, 5.7GiL, 5.7GXiL Marine Engines.) (GM Blocks)

The ARCO Marine Zeus A275L Vortec Alternator is designed to deliver the highest power output within its class, making it ideal for demanding marine, RV, military, and commercial applications. Engineered for high energy production, this alternator rapidly charges large battery banks, ensuring reliable power supply for critical systems. Its advanced cooling features, including heat shedding coatings, exterior rectifier placement, dual cooling fans, and OEM components, enable it to operate 8 to 20% cooler than traditional alternators, resulting in increased performance and longevity. The A275L is optimized for performance even at idle speeds, reducing the need for a separate generator by generating additional power directly from your engine. Its durable finish, available in Cerakote or E-coat, absorbs less heat, allowing the alternator to sustain higher amperage levels for extended periods, especially during peak load conditions. For maximum performance and control, it supports Bluetooth regulation via ARCO Zeus Bluetooth alternator regulator and lithium battery charging options. Certified SAE J1171 and proudly made in the USA, this alternator is a reliable choice for demanding power needs.

Technical specifications include a 12V system with a 16-pole rotor, a stator size of 138mm, and a large frame design. It weighs approximately 15 pounds and features an internal regulation system with an optional external regulation adaptor. The default output voltage is 14.1 volts, and it operates efficiently from just over 1,000 RPM up to 19,000 RPM. The alternator’s mounting configuration replaces Mando-type units using Vortec/GM pad mounting feet, common on many Mercruiser and Volvo Penta marine engines. Equipped with a standard 6-groove pulley, M17 x 1.5 threaded shaft, and hardware, it is built for easy installation. Its diode assembly includes 6 positive and 6 negative avalanche-rated diodes rated at 50 amps each, capable of delivering a maximum cold output of 311 amps and sustained hot output of 227 amps at 6,000 RPM. The alternator's maximum continuous operating temperature is 230°F, ensuring dependable operation under heavy loads.

Designed for versatile mounting on GM blocks, this alternator replaces Mando-type units and is suitable for engines like Mercruiser and Volvo Penta 3.0GLM, 4.3GXi, and 5.7GXiL models. Its robust construction and high-performance features make it an excellent choice for applications requiring reliable, high-output power with advanced thermal management and efficiency.

Features:

• Engineered for high energy production and rapid charging of large battery banks

• Suitable for marine, RV, military, and commercial applications

• Operates 8 to 20% cooler due to heat shedding coatings, exterior rectifier, dual cooling fans, and OEM components

• Optimized for high performance at idle speeds, reducing the need for a generator

• Advanced coating absorbs less heat, enabling higher amperage output for longer durations

• Supports Bluetooth regulation with ARCO Zeus Bluetooth alternator regulator

• Lithium battery charging compatible for enhanced performance

• SAE J1171 certified, made in the USA

• Replaces Mando-type alternators using Vortec/GM pad mounting feet

• s a 14.1V default output, with a maximum RPM of 19,000 for high-power applications