ARCO Marine Zeus A275L Vortec Alternator with Terminal Block for Marine and RV Applications

Zeus A275L Vortec Alternator with Terminal Block

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 - External Only (These units will come with a terminal block and a P-Type harness. They will only work with an external regulator, such as an ARCO Zeus Bluetooth alternator regulator.)


• 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 offers the highest power output in its size class, making it an ideal choice for demanding marine, RV, military, and commercial applications. Designed for high energy production, this alternator rapidly charges large battery banks and operates at cooler temperatures, ensuring sustained performance even under heavy loads. Its advanced heat shedding coatings and dual cooling fans help it run 8 to 20% cooler than traditional alternators, reducing thermal stress and extending component life. Optimized for performance at idle speeds, the A275L can generate significant amperage, minimizing the need for a separate generator and improving overall energy efficiency. Its robust construction includes OEM components and a Cerakote/E-coating finish, which absorbs less heat and maintains cooler operating temperatures during prolonged use. For maximum performance, pairing with an ARCO Zeus Bluetooth alternator regulator or lithium battery charger is recommended, allowing precise control and efficient power management.

Constructed with a 12-volt system, this alternator features a P-type field, 16 rotor poles, and a 138mm stator size. It is designed with a large frame and weighs approximately 15 pounds, making it suitable for various mounting configurations. The unit comes with a terminal block and an external regulation setup, compatible with external regulators like the ARCO Zeus Bluetooth model. With a regulated output voltage of 14.1 volts and a maximum RPM of 19,000, the A275L delivers up to 311 amps at cold startup and maintains high amperage at hot operating temperatures. Its M8 side mount battery post, 6-groove pulley, and threaded shaft ensure easy installation and compatibility with many engine types. Certified SAE J1171 and made in the U.S.A., this alternator is built for durability and reliable performance in demanding environments. Whether replacing an existing Mando-type alternator or upgrading your system, the ARCO Marine Zeus A275L provides the power and efficiency required for modern marine and heavy-duty applications.

Features:

• Engineered for high energy production and rapid battery charging

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

• Optimized for performance at idle speeds, reducing reliance on external generators

• Advanced coating (Cerakote/E-coat) absorbs less heat, enabling sustained high amperage output

• Compatible with ARCO Zeus Bluetooth alternator regulator and lithium battery chargers for enhanced control

• Certified SAE J1171 for quality assurance

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

• Heavy-duty construction with a large frame and robust components