![ARCO Marine Zeus A275L J180 4" Alternator w/Isolated Ground Regulator [4025]](https://cdn.shopify.com/s/files/1/0855/3916/0358/files/107509XL.jpg?v=1738864146)
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Description
ARCO Marine Zeus A275L J180 4" Alternator w/Isolated Ground Regulator [4025]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
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)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 2483 reviews
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Product Reviews
★★★★★ 5
Beautiful lux sheepskin, you won't be disappointed!
Size: Single Pelt/2 ft x 3 ft, Color: Grey
I just got this today, 2 day delivery. It's a beautiful silver grey 2'x3', no smell, no shedding, super soft and has a luxurious feel. I can't believe it's real and so affordable! I have it draped on an ottoman in front of the couch. I love it and already want to buy a few more for my mid century modern couch and chairs. So chic! Highly recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 9, 2026
★★★★★ 5
Soft and great quality
Size: Single Pelt/2 ft x 3 ft, Color: Blue, Size: Single Pelt/2 ft x 3 ft, Color: Blue
Beautiful and very soft. Love the color
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 2, 2026
★★★★★ 4
Very nice if you aren't too pick on actual color.
Size: Single Pelt/2 ft x 3 ft, Color: Blue
Colors may vary. I really liked this, it was the perfect size and that perfect combination of soft and fluffy, but not being "too fluffy" and looking like a shaggy dog that needed a haircut. My only complaint was the color. Supposed to be blue, and I know monitors and lighting distort stuff but this was an obvious turquoise/teal. Much much greener than I was looking for. I could have made any variant of an actual blue work from powder baby to practically navy, but not this. I had to return, but other than the color, this seemed to be a very nice rug. Sad the color was so off.
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Reviewed in the United States on February 10, 2025
★★★★★ 5
Very Nice
Size: Double Pelt/2 ft x 6 ft, Color: Mocha
Great in my office chair for added comfort
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 9, 2026
★★★★★ 5
It is real and natural. No synthetic- no allergy!!!
Size: 2' x 6' (Double Pelt), Color: Brown Tipped
SUPER QUALITY, the color is exactly like on the picture, I love it!!!
Thank you!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
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