Description
Description
Zeus A225S 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, running 8-20% cooler than incumbent alternators due to:
- 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. Our advanced coating absorbs less heat, keeping the A225S 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.
Specifications
Specifications
Identification
| MPN | 4013 |
|---|---|
| Barcode | 632085040130 |
General
| MPN | 4013 |
|---|---|
| Barcode | 632085040130 |
Electrical
| Output | 254A max (cold, 9,000 RPM) / 187A sustained cruising (hot, 6,000 RPM) / 157A sustained idle (hot, 3,000 RPM) |
|---|---|
| Voltage | 12V |
| Cut-In Speed | 1,061 alternator RPM |
| Max Alternator RPM | 19,000 |
| Regulated Output Voltage | 14.1V (default) |
| Regulator Type | External only — ships with terminal block/P-type harness; external regulator required |
| Diodes | 6 positive / 6 negative, 50A rated, avalanche |
Physical
| Mount Type | 3.15" J180 saddle, rear B+ post (Common Rail) |
|---|---|
| Ground Type | Isolated ground |
| Weight | 12 lbs / 6.7 kg |
| Stator/Frame | 130mm stator, small frame |
| Field Type | P-type field, 16 rotor poles |
| Pulley | 49mm K6 6-groove; 17mm dia. x 25mm shaft, M17x1.5 threaded |
Compatibility
| Fits | Yanmar Common Rail marine engines (post-2013) |
|---|
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In The Box
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* ALL WARRANTY IS THROUGH MANUFACTURE *

