ARCO Marine Zeus A275L 3.15 Alternator w/Isolated Ground (Common Rail) Terminal Block [4021]

Zeus A275L 3.15 Alternator: The Powerhouse for Your Needs!

This alternator stands out as the top - performer in its size and class, delivering the highest power output.

Key Features:

• Designed to generate high energy, it's perfect for marine, RV, military, and commercial uses.
• It can quickly charge large battery banks, saving you time.
• With its cool operating temperatures, it offers improved performance and comes with heat - shedding coatings.
• The rectifier on the housing exterior and dual cooling fans enhance its efficiency.
• Made with OEM components, it ensures reliability.
• Optimized for idle - speed performance, it can create extra power with your engine, reducing the need for a generator.
• The E - Coat/Cerakote keeps it cool for continuous high - amperage output.
• Pair it with the ARCO Zeus Bluetooth Alternator Regulator for best results, especially when charging lithium batteries.
• It's SAE J1171 Certified and available with internal or external voltage regulators.
• Proudly manufactured in the U.S.A.

Technical Details:

• Voltage: 12v
• Field Type: P
• 16 Rotor Poles and 138mm Stator Size
• Large Frame Size, weighing 14.9 lbs/6.7 kg
• Internal/External Regulation (Internally regulated with adaptor for external option)
• Default Output Voltage: 14.1v
• Finish: Black Cerakote or E - coating
• Cut - In RPM: 1,061 Alternator RPM
• Maximum Alt RPM: 19,000
• M8 Thread Post, Side - Mount Battery Post
• Standard 49K6 (6 - groove, 49mm) Pulley
• 17mm diameter, 25mm long, M17 x 1.5 threaded Pulley Mount
• Pulley Hardware included
• 6 positive, 6 negative, 50A Rated, Avalanche Diodes
• Max Cold Output at 9,000 RPM: 311 Amps
• Hot Sustained Cruising Output at 6,000 RPM: 227 Amps
• Hot Sustained Idle Output at 3,000 RPM: 198 Amps
• Max Continuous Operating Temperature: 110°C / 230°F

Mounting Requirement:

• Use it on Yanmar Common Rail models introduced after 2013 (JH - CR, 3JH40, 4JH45, 4JH57, 4JH80, 4JH110)

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Quick Guide (pdf)
Brochure (pdf)

Using the ARCO Marine Zeus A275L 3.15 Alternator is straightforward. First, make sure your engine is a Yanmar Common Rail model introduced after 2013, like JH - CR, 3JH40, etc. Install the alternator following the mounting instructions carefully. If you want maximum performance or to charge lithium batteries, use the ARCO Zeus Bluetooth Alternator Regulator. When it comes to maintenance, regularly check the pulley and its hardware to ensure they are tightened properly. Keep an eye on the operating temperature. If it gets close to the maximum of 110°C / 230°F, give the alternator a break to cool down. Also, make sure the battery post and other connections are clean and tight. In case you notice any unusual noises or a drop in performance, have it checked by a professional. With proper use and maintenance, this alternator will serve you well for a long time.