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Arco Starting & Charging 4027 Zeus A275L High-Output Marine Alternator 12V 275A

Manufacturer

Arco Starting & Charging

<h3>ARCO Starting &amp; Charging: The Marine Industry&apos;s Gold Standard</h3><p>When a boater turns the key and nothing happens miles from the dock, the name they wish they had trusted is <strong>ARCO Marine</strong>. For more than six decades, ARCO Starting &amp; Charging has been the benchmark for dependable marine engine electrical components — building and testing every unit at their facility in Pensacola, Florida to ensure each part meets or exceeds original equipment manufacturer (OEM) specifications before it ever reaches a customer.</p><p>Founded in 1960, ARCO set out with a straightforward mission: deliver peace of mind to boat owners and marine technicians through products they can rely on. That philosophy hasn&apos;t changed. Every component ARCO manufactures — from outboard <a href="/7236-arco-starting-charging-starter-motor-4152">starter motors</a> to high-output alternators — is rigorously load-tested beyond normal operating conditions. It&apos;s the kind of commitment that has made ARCO the trusted choice of professional marine service technicians and weekend boaters alike for generations.</p><h3>Purpose-Built for the Harshest Marine Environments</h3><p>Saltwater, humidity, and vibration are relentless adversaries for any electrical component. ARCO engineers their products specifically for these conditions. Their <a href="/7236-arco-starting-charging-tilttrim-motors-201071">tilt/trim motors</a> and <a href="/7236-arco-starting-charging-trim-and-tilt-units-201108">trim and tilt units</a> are designed to perform reliably through years of saltwater exposure, while their <a href="/7236-arco-starting-charging-alternators-200087">alternators</a> — including the advanced Zeus High Output Alternator line — are purpose-built to charge modern battery banks faster and handle the electrical demands of today&apos;s feature-rich vessels. ARCO makes OEM replacement parts compatible with leading engine manufacturers including Mercury, Yamaha, Volvo Penta, MerCruiser, Honda, Evinrude, Suzuki, and many others, making cross-referencing straightforward for technicians and DIYers alike.</p><h3>Innovation with the Zeus High Energy Platform</h3><p>ARCO&apos;s Zeus line represents the brand&apos;s push into next-generation marine charging technology. Zeus High Output Alternators and Bluetooth-enabled voltage regulators are engineered for multi-voltage compatibility and rated IP68 for protection against water intrusion — a critical specification in marine applications. The Zeus ecosystem is purpose-built to support lithium battery banks, high-draw accessories, and demanding live-aboard or commercial use cases where consistent power output is non-negotiable.</p><h3>OEM Quality, Factory Warranty, American-Made</h3><p>ARCO backs their entire rotating electric parts lineup — including their <a href="/7236-arco-starting-charging-starters-inboard-201008">inboard starters</a> — with the ARCO Assurance warranty program, offering coverage against defects in materials and workmanship. Manufacturing, quality testing, warehousing, and fulfillment all take place in the United States, giving buyers confidence in consistent quality control from start to finish. For anyone maintaining a vessel and unwilling to compromise on reliability, ARCO Starting &amp; Charging remains the definitive choice in marine engine electrical components.</p>

Part Number

4027
09/12/2036 8:29 AM
Sale Price

$915.58

In Stock (10)

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Product Details

The Arco Zeus A275L is a high-performance 275-amp alternator designed to deliver the highest power output in its size class. Engineered specifically for marine, RV, military, and commercial applications, this 12-volt alternator excels at rapidly charging large battery banks while maintaining the coolest operating temperatures in demanding environments.

Key Features:

  • Exceptional cooling performance: Runs 8-20% cooler than comparable alternators through advanced heat-shedding coatings, exterior-mounted rectifier, and dual cooling fans
  • Premium E-Coat/Cerakote finish absorbs less heat, enabling sustained high-amperage output
  • Optimized for peak performance at idle speeds with impressive 198-amp output at 3,000 RPM
  • High-capacity output: 311 amps maximum (cold, 9,000 RPM), 227 amps sustained cruising (hot, 6,000 RPM)
  • Reduces or eliminates the need for onboard generators by maximizing engine-driven power production
  • Compatible with ARCO Zeus Bluetooth alternator regulators for maximum performance and lithium battery charging
  • SAE J1171 certified for quality and reliability
  • Made in the USA with premium OEM components

Technical Specifications:

  • Voltage: 12V output (14.1V default regulation)
  • Output: 275A rated (311A max cold, 227A sustained cruising, 198A sustained idle)
  • Field Type: P-Type (external regulation only)
  • Stator: 138mm, 16-pole rotor design
  • Frame: Large single-foot mounting (1" or 2" foot)
  • Weight: 14.9 lbs (6.7 kg)
  • RPM Range: 1,061 cut-in to 19,000 maximum alternator RPM
  • Pulley: 49K6 (6-groove, 49mm) on 17mm diameter shaft
  • Shaft: 17mm diameter × 25mm long, threaded M17 × 1.5
  • Battery Post: M8 thread, side mount
  • Diodes: 12 total (6 positive, 6 negative), 50A rated avalanche type
  • Maximum Operating Temperature: 110°C (230°F) continuous
  • Finish: Black Cerakote or E-coating for superior heat dissipation

What's Included:

  • Zeus A275L alternator with terminal block
  • P-Type wiring harness
  • Pulley hardware: M17 × 1.5 × 24mm nut with 18mm ID × 29mm OD washer

Application: Replaces most domestic-style alternators using a single 1" or 2" mounting foot, including Motorola and Prestolite configurations. Note: Requires an external regulator such as the ARCO Zeus Bluetooth alternator regulator for operation.

very good !

Excellent prices and fabulous customer service!

They had a hard to find pump for a decent price. It arrived when they said it would. Haven't installed it yet so we'll see how it works

My product was shipped fast

Entering CVV was difficult

I received the bar and it looks to be very high-quality. However, this bar says it fits a 2003 through 2013 dodge ram 25 and 3500 series trucks. However, from 2003 to 2007-1/2. This truck comes with 1/2' (14mm) bolts. This bar only comes with the 14 mm and the upgraded 5/8' Hardware for the top joint. The lower joint connecting to the Axle only has the 5/8 hole and does not come with a reducing kit nor does it come with an upgraded 5/8' bolt, which would at least allow you to drill out the lower Mounting holes to mount this bar. As a result, you cannot use the original bolt and you have to go to Supply store to find the correct size bolt to allow you to mount this track bar. Highly inconvenient for the customer, especially when there is no mention of this in the description for the part. At the bare minimum, this track bar should've came with the second 5/8' bolt With the kit.

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