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Arco Starting & Charging 20100 Replacement Inboard Marine Alternator

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

20100
09/12/2036 6:27 AM
Sale Price

$208.91

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Product Details

The Arco Starting & Charging 20100 is a high-performance replacement alternator designed for marine diesel engine applications. This self-exciting alternator features an internal voltage regulator for simplified installation and reliable charging performance in harsh marine environments.

Key Features:

  • Self-exciting internal regulator eliminates the need for external voltage regulation
  • Negative ground configuration for compatibility with most marine electrical systems
  • Simple 1-wire connection for easy installation and minimal wiring
  • Single groove pulley for standard belt drives
  • Compact 2-inch mounting foot for secure installation in tight engine compartments
  • Designed specifically for marine diesel engine applications

This alternator provides dependable charging power for batteries and onboard electrical systems. The self-exciting design and integrated regulator make it an ideal replacement for aging or failed alternators on inboard diesel engines, offering straightforward installation with minimal electrical modifications.

Products specifications

Description

12 Volt, 70 Amp

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Very, very good price on an item that I have been wanting for a very long time. I'll be sure to check here first when shopping for an item of interest! Thanks.

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