![ARCO Marine Zeus A225S 3.15 Alternator w/Case Ground (Common Rail) Terminal Block [4012]](https://cdn.shopify.com/s/files/1/0855/3916/0358/files/107519XL.jpg?v=1738962363)
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Ships within 48 hours · Estimated delivery Jul 10 - Jul 15
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Description
ARCO Marine Zeus A225S 3.15 Alternator w/Case Ground (Common Rail) Terminal Block [4012]Zeus A225S 3. 15 Alternator with Case 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
Zeus A225S 3.15 Alternator with Case 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.
Technical Specifications:
- Voltage - 12v
- Field Type - P
- Rotor Poles - 16
- Stator Size - 130mm
- Frame Size - Small
- Weight - 12 lbs/5.4 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) - 254 Amps
- Sustained Cruising Output (Hot, 6,000 RPM) - 187 Amps
- Sustained Idle Output (Hot, 3,000 RPM) - 157 Amps
- Max Continuous Operating Temperature - 110°C / 230°F
Mounting Application:
- Must be used on Yanmar Common Rail introduced after 2013 (JH-CR, 3JH40, 4JH45, 4JH57, 4JH80, 4JH110)
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
4.3 ★★★★★
Based on 1876 reviews
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Product Reviews
★★★★★ 5
Actual, honest-to-goodness fast charging
Color: Black
After unsuccessfully buying two different so-called "fast" chargers that completely lied about their charging ability, specifically for the Apple watch, I finally bought this one. What a world of difference! I have an Apple watch ultra, which is fantastic on battery life, and I appreciate that I can actually wear it while I sleep. I have to charge it about every day and a half, which means that sometimes I need to top it up while I'm at work. (Alternatively, I could be a slave about charging it every day at home, but part of the reason I switched to the Ultra is to not have to be that obsessive about charging.)
Anyway, I needed a good charger at work. I ordered one that claimed to be 5W watch charging, and it blatantly lied. It took over an hour to get about 20% of a charge. I ordered another, similar results. This one is night and day different. My watch will fully charge at the posted speeds Apple boasts about with fast chargers. If it's running a little low during the day, I can pop it on the charger for 20-30 minutes and have enough juice to last through my hour+ swim workout, no problem.
The phone charger is fast, too, and if you use a magsafe case, it has a very firm hold. Without a magsafe case, your phone may drop off the charger (mine did), which is frustrating. Since I have another magsafe charger at home, I just bought a new case (they're cheap) and now I'm super happy with this.
The contact charger on the back will work to charge your phone (or a second phone) or earbuds, too.
Very happy with this purchase. It's a bit pricier than the cheapo other brands, but it actually freaking works and charges quickly. It's worth the money.
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Reviewed in the United States on February 11, 2026
★★★★★ 5
Secure Mount With Premium Feel
This phone mount feels incredibly sturdy once installed. No shaking or movement while driving, even on rough roads. The design looks clean and factory installed instead of bulky like a lot of other mounts. It holds the phone securely and keeps it easy to access for navigation.
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Reviewed in the United States on May 15, 2026
★★★★★ 5
Good Solid Mount
Got for my 2019 TRD Off Road. Works great, solid mount. Phone easy in, easy out once you get used to it. Looks and feels well made.
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Reviewed in the United States on May 19, 2026
★★★★★ 5
Solid Product
I was a bit skeptical based on the price ($85 total after taxes) but you can tell that for the price, this thing is sturdy and high quality. Holds solid onto the vent and keeps my iPhone in place. Easy to adjust and move to your liking, also easy to turn 90* and have your phone sideways. Only drawback is that is obstructs the view of the clock on my 4Runner and slightly obstructs my windshield, but I am sure I will get used to it.
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Reviewed in the United States on May 14, 2026
★★★★★ 5
Great phone holder
I use this phone mount in my Subaru Impreza, and it works perfectly with my vents. It holds my phone super securely—no wobbling or slipping—so it’s great for navigation or hands-free use. Really solid and reliable for the price.
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Reviewed in the United States on November 5, 2025