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Arco Starting & Charging A275L-12-DF315-EX-49K6 Zeus 275A High Output Marine Alternator 12V

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-EX-49K6
09/12/2036 7:52 AM
Sale Price

$934.02

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Product Details

The Arco Zeus A275L J-180 High Output Alternator delivers the highest power output in its size class, engineered specifically for demanding marine, RV, military, and commercial applications. This 12-volt alternator produces up to 311 amps at maximum output, making it ideal for rapidly charging large battery banks without relying on a generator.

Advanced Cooling Technology:

  • Runs 8-20% cooler than comparable alternators through heat-shedding Cerakote/E-coat finish
  • Externally mounted rectifier dissipates heat away from internal components
  • Dual cooling fans maintain optimal operating temperatures
  • Maximum continuous operating temperature of 230°F (110°C)

Performance Specifications:

  • Maximum output: 311 amps (cold, 9,000 RPM)
  • Sustained cruising output: 227 amps (hot, 6,000 RPM)
  • Sustained idle output: 198 amps (hot, 3,000 RPM)
  • Optimized for high performance at idle speeds
  • 138mm stator size with 16 rotor poles
  • 12 avalanche-rated diodes (6 positive, 6 negative, 50A rated)

Technical Details:

  • External regulation only (P-Type field, includes terminal block and P-Type harness)
  • Compatible with Arco Zeus Bluetooth alternator regulator for maximum performance
  • 3.15" J-180 saddle style mounting replaces Hitachi, Lucas, Mitsubishi small case styles
  • 49K6 standard pulley (6-groove, 49mm) on 17mm diameter shaft
  • M8 thread post battery connection, side mount
  • Cut-in RPM: 1,061 alternator RPM / Maximum RPM: 19,000
  • SAE J1171 Certified

What's Included: Alternator with terminal block, P-Type harness, pulley hardware (M17 x 1.5 x 24mm nut with washer)

Made in the USA with premium OEM components. The Cerakote/E-coat finish absorbs less heat for sustained high-amperage output, making this alternator the professional choice for vessels and vehicles requiring reliable, high-capacity charging systems.

Note: This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.

So Far So Good. i will continue to check you guys out.

quick and easy great price

Order clutch set for 1966 corvair it is not the correct part called customer service they say don't show one yet web says the one shown is correct

Part was in stock and simple to check out

Called customer service just to verify the part fits.

Different # on product part. I'm hoping it is still correct part to fit.

Part arrived early and was a direct fit. Thank you

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Received right on time

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