SKU: 46431672520

ARCO Zeus A275L 3.15 Alternator w/Isolated Ground (Common Rail), Terminal Block Zeus High-Energy Alternator Regulator [4021-AZ1000]

Sale price$851.72 Regular price$946.35
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Ships within 48 hours · Estimated delivery Sep 25 - Sep 30

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Description

ARCO Zeus A275L 3.15 Alternator w/Isolated Ground (Common Rail), Terminal Block Zeus High-Energy Alternator Regulator [4021-AZ1000]Zeus A275L 3. 15 Alternator with Isolated Ground (Common Rail), Terminal Block & Zeus High Energy Alternator Regulator Zeus A275L 3. 15 Alternator with Isolated Ground (Common Rail) & 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

Zeus A275L 3.15 Alternator with Isolated Ground (Common Rail), Terminal Block & Zeus High-Energy Alternator Regulator

Zeus A275L 3.15 Alternator with Isolated Ground (Common Rail) & 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.
  • Heat-shedding coatings
  • Rectifier located on housing exterior
  • Dual cooling fans
  • OEM components
  • 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, keeping the A275L cooler for sustained amperage output.
  • Use the ARCO Zeus Bluetooth Alternator Regulator for maximum performance or lithium battery charging.
  • SAE J1171 Certified.
  • Models are available with an internal/external voltage regulator.
  • Proudly 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 - 110°C / 230°F

Mounting Application:

  • Must be used on Yanmar Common Rail introduced after 2013 (JH-CR, 3JH40, 4JH45, 4JH57, 4JH80, 4JH110)

Zeus High-Energy Alternator Regulator

ARCO’s Zeus is the only high-energy external alternator regulator to feature Bluetooth and a native app (on IOS and Android) allowing for easy installation and configuration. With its intuitive interface, you can access information on your system that you never had before. This information will enable you to regulate your system and optimize your battery charge and alternator output, resulting in a safer experience while protecting your energy system investment.

Zeus is the only alternator regulator that can read 2 shunts at a time (the battery shunt and alternator shunt). This feature enables Zeus to react to inputs from the battery current/temperature and alternator current/temperature.

Through the ARCO Zeus application, you are in good hands. Your data is automatically logged and can be shared with your technician to troubleshoot your system remotely. You can even import your remote technician’s configurations. 

Zeus optimizes battery charges for 12-48 volt systems. Whether you are using Lithium (LiFePo4) batteries or lead-acid Deep Cycle batteries, Zeus has you covered with its pre-set battery libraries and configurable menus to optimize your charging profiles. Zeus manages a complex set of inputs by giving you easy-to-understand options.

Zeus also takes into consideration the power of your engine and allows you to configure the alternator’s power take-off from the engine by managing the field, or duty. An advanced feature of Zeus is that it can turn your engine into a dedicated generator with the press of a button, whereby it focuses the alternator’s performance on the creation of energy to replenish your battery bank quickly.

Consistent with Zeus’ ease of use, Zeus is the only alternator regulator on the market that comes with alternator/battery harnesses and 2 thermistor harnesses, without an additional charge, saving users money and time from sourcing harnesses.

Features:

  • Secure Bluetooth connection
  • Harnesses, Thermistors, and NMEA 2000 kit included
  • Monitors the state of charge
  • Can turn your engine into a dedicated generator with generator mode
  • Pre-set battery libraries
  • Data logging and sharing
  • CAN bus and NMEA 2000-integrated networks
  • Compatible with all voltage systems (12- 48V)
  • IP66 & IP67 rated
  • 2-Year warranty

Technical Specifications:

  • Enclosure dimensions without antenna - 8.2" x 5.9" x 2.4" 
  • Enclosure dimensions with antenna - 8.2" x 7.5" x 2.4"
  • Weight - 1.7 lbs

In the Box:

  • Zeus high-energy alternator regulator
  • Battery wiring harness
  • Alternator wiring harness
  • 2 thermistors
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 46431672520

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4.1 ★★★★★
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Vshehane
San Leandro, US
★★★★★ 5
Really supportive, comfortable pillows, great value.
Size: Queen Size(2 Pack)
When I received these pillows, I followed the directions to fluff them. They were delivered vacuum packed. The first night I slept on them, I didn’t remove any of the filling. That was a problem because the pillows are so over stuffed that it was difficult to sleep on them. I was disappointed until I removed about 1/3 of the filling. Doing so made all of the difference. These pillows are very nice. They keep their shape during the night and provide excellent support for my neck and head. They don’t flatten out or separate like regular shredded foam pillows. They are well made with an outer cooling cover as well as a inner zippered cover for the foam. I love the fact that these pillows are adjustable. I saved the foam I removed in the zippered bag the pillows arrived in, in case I needed to restore the foam in the future. They are a very good value for the money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 25, 2025
A
Verified Purchase
Amazon Customer
New York, US
★★★★★ 4
Not cooling throughout the night
Size: Standard Size(1 Pack)
The quality of the pillow was great the stitching as well. The one side did feel cool, but it did not last throughout the evening. Also, it was too thick for my neck and caused me headaches. The phone pieces that are inside made me concerned that after time they would flatten and the pillow would get firm. I am a hot sleeper and I expected it to stay cool longer than two hours. Because of that I returned it, but if you like thick pillows, and you’re not a hot sleeper, it may work for you.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 4, 2026
J
Verified Purchase
Jake
Port Orchard, US
★★★★★ 5
Fantastic I highly recommend him
Size: Queen Size(2 Pack)
We have had these pillows for over a year. I can honestly tell you I absolutely love them. They are cool and extremely comfortable. I like them so much I bought a second set for our camper.
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Reviewed in the United States on June 4, 2026
M
Verified Purchase
Matt
Belleville, US
★★★★★ 3
Decent pillow
Size: Standard Size(1 Pack)
Nice pillow. When first opening it you fluff it and put it in the dryer for about 10 minutes, comes out exactly how I like my pillows, firm but has a little bit of softness. Used this pillow for several nights now. Holds it's shape at the start of the night, but when I wake up its sorta flat and had a smashed feel to it. Fluffs back to it's original size and shape. Just wish it was more dense with about 1/4 to 1/2 more foam inside. Would probably help firm it up and hold it's shape better.
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Reviewed in the United States on June 1, 2026
M
Verified Purchase
MarieKristie
Bozeman, US
★★★★★ 5
Firm and dense to the Extreme!!
Size: Queen Size(2 Pack)
I love my pillows, extremely firm and also extremely dense. I hate when a pillow gets worn down in the middle after like a few weeks or a month and then you’re struggling to get it full again. It’s absolutely impossible. When I got these pillows, it said that it might take 24 hours for them to fully enlarge. I enrolled them and took a look at this flat thin thing and I thought, oh my God, I made a huge mistake in ordering these. Went into the kitchen, made some dinner after dinner went into my bedroom and holy moly, these pillows were massive. I was so excited and I couldn’t wait to sleep on them. Now mind you, I am a side sleeper, so that’s why I like a very full and firm pillow. I do love how full they are, however, it was a little much. Luckily, you can unzip them and take some of the filling out. A little tip is to keep the little zipped bag they give you and you can put some extra filling in there and zip it and if you ever want to fill it back up, it’s easy. I took about 15% of the filling out of each pillow which to me was perfect, but I could see people wanting to take much more out. I love that you have the option of taking it out and putting it back in if you ever need to, but I don’t think you’ll need to because these pillows will never get squishy or flat. I love these pillows so much that I don’t know if I could ever exist without them. Please never discontinue these because if I ever need to get another set, I want them available. Best pillows I’ve ever had in my entire life. Period!
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Reviewed in the United States on December 15, 2025

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