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Seasonal Pick Arco Marine Zeus A275l J180 4" Alternator W/isolated Ground Regulator [4025] A Gift They'll Love [Cq9Gw20u]

$41.99 $134.99 -69%

Zeus A275L J180 4" Alternator with Isolated Ground & 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 la

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Seasonal Pick Arco Marine Zeus A275l J180 4" Alternator W/isolated Ground Regulator [4025] A Gift They'll Love [Cq9Gw20u]

Zeus A275L J180 4" Alternator with Isolated Ground & 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.
  • 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:

  • Replaces most Volvo Penta alternators using a 4” J180 saddle-style mount

Quick Guide (pdf)
Brochure (pdf)

What Our Customers Say

January 16, 2026

Absolutely no complaints!

A great product. And I'm happy with it.

- Jody E..

January 16, 2026

Absolutely no complaints!

A great addition to my whole toolkit.

- Jemma D..

January 16, 2026

Absolutely no complaints!

It’s a very well-made and very handy tool.

- Jared F..

Write a Review

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