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Arco Starting & Charging A275L-12-DF315-IE-49K6 Zeus Marine Alternator 12V 275A J-180 Mount

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

A275L-12-DF315-IE-49K6
09/12/2036 7:52 AM
Sale Price

$1,035.40

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Product Details

The Arco Zeus A275L is a high-performance 12-volt marine alternator engineered to deliver exceptional power output in a compact 3.15" J-180 saddle mount design. This premium alternator is designed for marine, RV, military, and commercial applications where reliable high-amperage charging is essential for large battery banks and demanding electrical systems.

Advanced Thermal Management:

  • Runs 8-20% cooler than conventional alternators through innovative engineering
  • Heat-shedding Cerakote or E-coat finish absorbs less heat for sustained high output
  • Externally mounted rectifier improves heat dissipation
  • Dual cooling fans maintain optimal operating temperatures
  • Maximum continuous operating temperature of 230°F (110°C)

Exceptional Power Output:

  • 311 amps maximum output (cold, 9,000 RPM)
  • 227 amps sustained cruising output (hot, 6,000 RPM)
  • 198 amps sustained idle output (hot, 3,000 RPM)
  • Optimized performance at idle speeds for superior low-RPM charging
  • Rapidly charges large battery banks, reducing or eliminating need for generators

Technical Specifications:

  • Voltage: 12V with 14.1V default output voltage
  • Field Type: P-type with 16 rotor poles
  • Stator Size: 138mm with large frame construction
  • Regulation: Internal with adapter for optional external regulation
  • Diodes: 6 positive, 6 negative, 50A rated avalanche type
  • Cut-in RPM: 1,061 alternator RPM
  • Maximum RPM: 19,000
  • Weight: 14.9 lbs (6.7 kg)

Mounting and Connections:

  • 3.15" J-180 saddle style mount (replaces Hitachi, Lucas, Mitsubishi styles)
  • Compatible with most Yanmar engines
  • 49K6 standard pulley (6-groove, 49mm diameter)
  • 17mm diameter shaft, 25mm long, threaded M17 x 1.5
  • M8 thread battery post with side mount configuration
  • Mounting hardware and washer included

Quality and Certification:

  • SAE J1171 certified for marine applications
  • Made in the USA with OEM components
  • Compatible with ARCO Zeus Bluetooth alternator regulator for maximum performance
  • Suitable for lithium battery charging with proper external regulator

This alternator represents the highest power output available in its size class, making it ideal for vessels with extensive house loads, inverter systems, and large battery banks requiring rapid, efficient charging even at engine idle speeds.

Incredibly fast and prompt service

Very fast and easy

Was very fast and reliable

Good, just hope what I ordered is what I&#039;m looking for!

Excellent and fast

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