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Description
ARCO Marine Zeus A225S Vortec Alternator w/Terminal BlockZeus A225S Vortec Alternator with 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. Runs 8 20% cooler than incumbent alternators due to: Heat shedding coatings Rectifier located on housing exterior Dual cooling fans OEM
Zeus A225S Vortec Alternator with 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. Runs 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. This translates to more amperage for sustained periods.
- For maximum performance or lithium battery charging, use an ARCO Zeus Bluetooth alternator regulator.
- SAE J1171 Certified.
- Proudly made in the U.S.A.
Technical Specifications:
- Voltage - 12v
- Field Type - P
- Rotor Poles - 16
- Stator Size - 130mm
- Frame Size - Small
- Weight - 12lbs/6.7kg
- Regulation - External Only
- 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) - 254 Amps
- Sustained Cruising Output (Hot, 6,000 RPM) - 187 Amps
- Sustained Idle Output (Hot, 3,000 RPM) - 157 Amps
Mounting Application:
- Replaces Mando type alternators using Vortec/ GM pad mounting feet (Found on many Mercruiser and Volvo Penta 3.0GLM, 3.0GLP, 4.3GXi, 5.7GiL, 5.7GXiL Marine Engines.) (GM Blocks)
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
4.1 ★★★★★
Based on 21 reviews
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Product Reviews
★★★★★ 3
Good quality cloth, but shrinks
Fit Type: Regular Fit, Color: Black/Black, Size: X-Large
Nice fabric. But it shrinks after the first wash
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2026
★★★★★ 5
Durable, Comfortable, and a Great Everyday Basic
Size: XX-Large, Color: Navy, Pocket Description: Plain Front
The Amazon Essentials Men’s Relaxed-Fit Heavyweight Cotton T-Shirt is exactly what a good basic tee should be—comfortable, well-made, and built to last. The heavyweight cotton feels substantial without being stiff, and it holds its shape nicely after multiple washes.
The relaxed fit gives plenty of room for movement without looking sloppy, and the fabric has just the right amount of structure for a polished casual look. It works equally well for layering under flannels or wearing on its own.
Pros:
• Thick, high-quality cotton that feels durable
• Relaxed fit for comfort and ease of movement
• Retains shape and color after washing
• Versatile for casual wear or layering
Cons:
• Slightly longer length may not suit shorter torsos
• Limited stretch since it’s 100% cotton
Bottom line: A sturdy, well-fitting T-shirt that’s perfect for everyday wear. Great quality for the price and likely to become a wardrobe staple.
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Reviewed in the United States on August 12, 2025
★★★★★ 5
Great Color and Great Fit !
Size: X-Large, Color: Bright Poppy Red, Pocket Description: Plain Front
I purchased sever bright shirts on Amazon for bike riding near busy streets. This shirt is perfect. It fits and feels good. After washing the color held strong. Very happy with this purchase.
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Reviewed in the United States on June 12, 2026
★★★★★ 4
Good quality T-shirt at a very reasonable price
Size: Large, Color: Dusty Blue, Pocket Description: Plain Front
Good quality T-shirt at a very reasonable price. The material feels thick and durable, giving it a premium feel. Fits well for a size L (5’10”, 178 lbs). The only downside is the sleeve length—they run a bit long and sit just above the elbow, so they don’t really highlight the biceps.
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Reviewed in the United States on April 17, 2026
★★★★★ 5
Super comfy, great fabric and totally worth the money
Size: Medium, Color: Navy, Pocket Description: Plain Front
I love this shirt! The quality is great and the fabric feels like it will last very long. Super comfy and the color is exactly as described. Washed it a few times but didn't lose any color or shape - didn't shrink either. It's a deal for the money. Must have if you are into round neck plane t-shirts. It can be unisexual too so if you're a girl looking for a lose plane round neck t-shirt, you can buy this too
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Reviewed in the United States on March 23, 2026