# ARCO Marine Zeus A275L 3.15 Alternator w/Isolated Ground  Terminal Block [4019]

**Zeus A275L 3.15 Alternator with Isolated Ground & 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 available with 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 small case styles using a 3.15" saddle style mount (e.g., Hitachi, Lucas, Mitsubishi). Most Yanmars. Requires Standard single "V" belt upgrading to a Serpentine System

  
[Quick Guide (pdf)](https://productimageserver.com/literature/quickGuide/107504QG.pdf)  
[Brochure (pdf)](https://productimageserver.com/literature/brochure/107504BR.pdf)

## Details

- **Price:** 1096.7 USD
- **Type:** Alternators
- **Tags:** Brand_ARCO Marine, Engine Parts & Service, Engine Parts & Service | Alternators, MRP

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1096.70 USD | In stock |

## Images

- ARCO Marine Zeus A275L 3.15 Alternator w/Isolated Ground  Terminal Block [4019] ARCO Marine
- ARCO Marine Zeus A275L 3.15 Alternator w/Isolated Ground  Terminal Block [4019] ARCO Marine

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> Source: [Besafe1st](https://besafe1st.com/products/arco-marine-zeus-a275l-3-15-alternator-w-isolated-ground-terminal-block-4019)
> Updated: 2026-05-22