Sale!
ARCO Marine Zeus A275L 1″-2″ Single Foot Alternator w/Isolated GroundTerminal Block [4028]
Original price was: $658.02.$359.67Current price is: $359.67.
38 in stock
Description
Zeus A275L 1″-2″ Single Foot 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 domestic styles using a single 1″ or 2″ mounting foot (e.g., Motorola, Prestolite). Requires Standard single “V” belt upgrading to a double “V” belt or Serpentine System
Quick Guide (pdf)
Brochure (pdf)

![ARCO Marine Zeus A275L 3.15 Alternator w/Case Ground (Common Rail)Terminal Block [4020]](https://www.goodcircuitsupply.com/wp-content/uploads/2026/09/arco-marine-zeus-a275l-3-15-alternator-w-case-ground-common-rail-terminal-block-.webp)
![ARCO Marine Zeus 24V 7kW Vortec Alternator w/Isolated Ground [4506]](https://www.goodcircuitsupply.com/wp-content/uploads/2026/09/arco-marine-zeus-24v-7kw-vortec-alternator-w-isolated-ground-4506.webp)
![ARCO Marine Zeus A275L 1"-2" Single Foot Alternator w/Isolated GroundTerminal Block [4028]](https://www.goodcircuitsupply.com/wp-content/uploads/2026/09/arco-marine-zeus-a275l-1-2-single-foot-alternator-w-isolated-groundterminal-bloc.webp)
![Balmar Offshore Repair Kit 60 Series 12V w/Bearings, Brushes, Regulator/Rectifier [7060]](https://www.goodcircuitsupply.com/wp-content/uploads/2026/09/balmar-offshore-repair-kit-60-series-12v-w-bearings-brushes-regulator-rectifier-.webp)
![Balmar Digital Duo Charge – 12/24V [DDC-12/24]](https://www.goodcircuitsupply.com/wp-content/uploads/2026/09/balmar-digital-duo-charge-12-24v-ddc-12-24.webp)
![Balmar Offshore Repair Kit AT Series 200AMP 12V Includes Bearings, Brushes, Rectifier [70-AT-200]](https://www.goodcircuitsupply.com/wp-content/uploads/2026/09/balmar-offshore-repair-kit-at-series-200amp-12v-includes-bearings-brushes-rectif.webp)
![Balmar Alternator 100 AMP 12V 1-2″ Single Foot Spindle Mount J10 Pulley w/Isolated Ground [621-100-J10]](https://www.goodcircuitsupply.com/wp-content/uploads/2026/09/balmar-alternator-100-amp-12v-1-2-single-foot-spindle-mount-j10-pulley-w-isolate.webp)
![Balmar Temperature Sensor Alternator – 80″ Length [MC-TS-A80]](https://www.goodcircuitsupply.com/wp-content/uploads/2026/09/balmar-temperature-sensor-alternator-80-length-mc-ts-a80.webp)
![ARCO Marine Premium Replacement Inboard Alternator w/Single Groove Pulley – 12V 55A [60125]](https://www.goodcircuitsupply.com/wp-content/uploads/2026/09/arco-marine-premium-replacement-inboard-alternator-w-single-groove-pulley-12v-55.webp)
![Balmar Universal Adjustment Arm [UAA]](https://www.goodcircuitsupply.com/wp-content/uploads/2026/09/balmar-universal-adjustment-arm-uaa.webp)
![Balmar Alternator 170 AMP 12V 3.15″ Dual Foot Saddle J10 Pulley [XT-CR-170-J10]](https://www.goodcircuitsupply.com/wp-content/uploads/2026/09/balmar-alternator-170-amp-12v-3-15-dual-foot-saddle-j10-pulley-xt-cr-170-j10.webp)