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Arco Starting & Charging 4503 Zeus 24V 7kW J180 Marine Alternator Isolated Ground

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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

4503
09/12/2036 8:58 AM
Sale Price

$1,236.09

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Product Details

The ARCO Zeus 24V 7kW alternator delivers exceptional high-amperage output at cruising and elevated RPMs, making it ideal for marine, RV, military, and commercial applications. This advanced alternator continuously produces over 3kW (109 Amps) at just under 3,000 alternator RPM and nearly 6kW (218 Amps) at under 6,000 RPM. In practical terms, a marine diesel engine at 1,500 RPM with a 2:1 pulley ratio generates over 3kW, while a Mercedes Sprinter at 1,800 RPM with a 3.21:1 ratio produces over 6kW.

Unlike competitor 24V alternators that utilize less efficient 12V rotors and field current, the ARCO Zeus features a native 24V rotor and field current. This design allows the alternator to run significantly cooler, directly extending its operational lifespan while providing superior output across all RPM ranges. The unit features a J180 4-inch saddle-style mount with isolated ground configuration.

Key Features:

  • Native 24V rotor and field current for maximum efficiency and cooler operation
  • Heat-shedding E-coating and Cerakote finish maintains sustained amperage output
  • External-mounted rectifier with 6 positive and 6 negative 80A rated avalanche diodes
  • Dual cooling fans for optimal thermal management
  • Rapidly charges large battery banks, reducing the need for separate generators
  • Compatible with ARCO Zeus Bluetooth Alternator Regulator for lithium battery charging
  • SAE J1171 Certified and proudly made in the USA
  • OEM-quality components throughout

Technical Specifications:

  • Voltage: 24V with isolated ground
  • Max Output (Cold, 9,000 RPM): 284 Amps / 7,810 Watts at 27.5V
  • Sustained Cruising Output (Hot, 6,000 RPM): 220 Amps / 6,050 Watts at 27.5V
  • Sustained Idle Output (Hot, 3,000 RPM): 50 Amps / 1,375 Watts at 27.5V
  • Cut-In RPM: 1,962 alternator RPM
  • Maximum Alternator RPM: 19,000
  • Stator Size: 138mm with 16 rotor poles
  • Weight: 15.89 lbs (7.2 kg)
  • Standard Pulley: 49K6 (6-groove, 49mm)
  • Pulley Mount: 17mm diameter shaft, 25mm long, threaded M17 x 1.5
  • Battery Post: M8 thread post, side mount
  • Max Continuous Operating Temperature: 212°F (100°C)
  • Regulation: External only (P-type field)
  • Finish: Black E-coating

Mounting Application:

Designed as a direct replacement for most Volvo Penta alternators using a 4-inch J180 saddle-style mount. Also compatible with many larger industrial-based engines. Pulley hardware (M17 x 1.5 x 24mm nut with 18mm ID x 29mm OD washer) is included.

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