ARCO Zeus A275L-12V High Output Alternator Yanmar Common RailNew Item

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ARCO Zeus A275L-12V High Output Alternator Yanmar Common Rail

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Two versions of the ARCO A275L Amp high output alternator, with 3.15” R Saddle mount. Designed for Yanmar Common Rail models introduced after 2013, including 3JH40, 4JH45, 4JH57, 4JH80, and 4JH110. Choose from Case Ground or Isolated Ground.
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Binnacle.com:   #11492
Brand:  ARCO Marine
MFG Part#:   A275L
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ARCO Zeus A275L-12V High Output Alternators

Choose from two 275 Amp ARCO A275L 12-volt high-output large frame alternators designed explicitly for the Yanmar JH-CR Series of 4-cylinder engines introduced in 1994. The ARCO A275L has the highest power density of any alternator in its size/class.

This generation of electronically controlled marine diesel engines utilizes Bosch Common Rail (CR) fuel-injection technology to meet EPA Tier 3 and EU RCD Stage 2 emission standards, providing improved fuel economy and reduced noise.

The JH-CR series includes the Yanmar models 3JH40, 4JH45, 4JH57, 4JH80, & 4JH110.

Available models are:

  • 4020 Case Ground - Common Rail, 3.15”R Saddle (Rear exit B+ post)
  • 4021 Isolated Ground - Common Rail, 3.15”R Saddle (Rear exit B+ post)

Each has the highest power output in Its Class.
  • Must be used with a Yanmar Common Rail models 3JH40, 4JH45, 4JH57, 4JH80, 4JH110
  • Replace your noisy generator
  • 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
  • For maximum performance or lithium battery charging, use the ARCO Zeus Bluetooth Alternator Regulator
  • SAE J1171 Certified
  • Housing: Dual Foot, 3.15" Rear Saddle (Rear exit B+ post) J180 
  • Maximum Output (Amps): 311A
  • Sustained Idle Output (Amps): 198A
  • Standard Pulley: 49K6 (6-groove, 49mm)
  • Both Models are externally regulated (EX), and 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.


  ARCO Zeus Alternator Installation Guide 2025

  ARCO Zeus Alternator & Regulator OEM Troubleshooting Guide

  ARCO Zeus High Output Alternator Testing Results 2024

ARCO Zeus A275L Common 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 (IE) or
External Only (EX)
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)
 

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Binnacle.com Shipping FAQ

Q. Do you offer Free Shipping?
A. We have free ground shipping via UPS or Canada Post within Canada on most orders of $99 or more (pre-tax).

Q. What do you mean by most orders?
A. Some items are exempt from this offer and are indicated on the product page. Exempt items include some paint products, bulky, heavy or long items. Some examples of Exempt items: Bottompaint, Anchors, Fenders, Buoys, Antennas. Over 98% of the items on Binnacle.com qualify for the free shipping offer.
To see what your shipping charge (if any) will be you can add the item(s) and quantities to the shopping cart and you will see a shipping cost calculator

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Q. What is the delivery time?
A.  NS, NB, PE: 1 - 2 business days,
      ON, QC, NL: 2- 4 business days
      MB, SK, AB: 4-5 business days
      BC: 5-7 business days
When your order ships you will be emailed a tracking number which will give you the scheduled delivery date

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Q. Do you require a signature on delivery?
A. We sometimes add a signature requirement especially if it is a high value package

Please Note:
Very Remote areas are exempt from Free Shipping offer. These are typically remote northern areas. Nunavut as well as many parts of the Yukon and NWT are exempt from free shipping

 4020 Case Ground - Common Rail 
This is a non-stocked item. Please allow a 2 week delay for your order to be shipped.
4020 Case Ground - Common RailBinnacle.com #: 17940 
12V, 275A, Double Foot 3.15”R Saddle (Rear exit B+ post), Case Ground, External Regulation required
MFG Part#: #: 4020
Our Price:CAD$1599.95 
Add to Cart
 4021 Isolated Ground - Common Rail 
4021 Isolated Ground - Common RailBinnacle.com #: 11492 
12V, 275A, Double Foot 3.15”R Saddle (Rear exit B+ post), Isolated Ground, External Regulation required
MFG Part#: #: 4021
Our Price:CAD$1599.95 
Add to Cart
Money Back Guarantee
Guarantee You may return your purchase to us (with a return authorization number - use this form) within 30 days and we will refund the purchase price of the product. Items which are cut to order (rope, wire etc), software, chart cards and printed materials (paper charts, books) are not returnable.

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