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Balmar 604-150-K6 604-Series 150 Amp 12V Dual Foot Marine Alternator with K6 Serpentine Pulley

Manufacturer

Balmar

<h3>About Balmar: Marine DC Power Since 1981</h3><p>Since its founding in 1981, <strong>Balmar</strong> has built a reputation as one of the most trusted names in marine DC power. For over four decades, the company has focused exclusively on helping sailors and power boaters solve one of the most persistent challenges on the water: keeping batteries charged reliably and efficiently. That singular focus has made Balmar the go-to choice for serious mariners who demand more from their electrical systems.</p><h3>Innovative Alternator Technology</h3><p>Balmar's greatest claim to fame is its lineup of <a href="/12782-balmar-alternators-200087">marine alternators</a> — widely regarded as the highest-output and most dependable alternators available in the recreational marine market. What sets Balmar apart is not just raw output, but smart engineering. Their patented <strong>Smart Ready&reg; Alternator</strong> technology allows the alternator to communicate directly with an external regulator, enabling precise, multi-stage charging profiles that protect batteries and extend their service life. Whether you're running a modest weekend sailboat or a fully outfitted bluewater passage-maker loaded with electronics, Balmar offers an <a href="/12782-balmar-alternator-2412">alternator</a> sized and engineered for the task.</p><p>Marine environments are uniquely demanding — salt air, vibration, and the need for long, uninterrupted charging cycles put far more stress on electrical components than typical automotive applications. Balmar designs its alternators specifically for these conditions, with robust construction and thermal management that keeps performance consistent even during extended motoring passages.</p><h3>Battery Monitors &amp; Charging System Management</h3><p>A high-output alternator is only part of the equation. Knowing the true state of your battery bank is equally critical, which is why Balmar also produces a respected line of <a href="/12782-balmar-battery-monitors-volt-meters-200146">battery monitors and volt meters</a>. These instruments give mariners accurate, real-time insight into battery voltage, state of charge, and current flow — the kind of data that prevents being stranded at anchor with a dead house bank. Balmar's monitoring products are designed to integrate seamlessly with their charging ecosystem, giving you a complete picture of your DC system's health at a glance.</p><h3>Expert Support &amp; a Legacy of Trust</h3><p>Beyond the products themselves, Balmar has long been recognized for its exceptional technical support. Marine electrical systems can be complex, and Balmar's knowledgeable team has a well-earned reputation for helping customers spec the right components and troubleshoot installations. That combination of innovative hardware and genuine expertise is a big reason why Balmar has remained a privately held, customer-focused company for over 40 years — and why the brand continues to be found aboard everything from coastal cruisers to offshore racing yachts.</p>

Part Number

604-150-K6
09/12/2036 1:04 PM
Sale Price

$680.44

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Product Details

The Balmar 604-150-K6 is a high-output marine alternator from Balmar's proven 604 Series, delivering 150 amps at 12 volts to meet the demanding charging needs of cruising sailboats, powerboats, and commercial vessels. Built for serious offshore and liveaboard applications, this alternator provides the robust output necessary to replenish large battery banks quickly and efficiently.

Featuring a 4-inch J-180-style saddle mount (dual foot) configuration, this alternator is a direct fit for a wide range of marine diesel engines commonly found aboard cruising and commercial vessels. The K6 serpentine pulley ensures compatibility with modern serpentine belt drive systems for smooth, reliable power transfer.

An isolated ground design is standard, which is essential for marine environments to prevent stray current corrosion — a critical feature for protecting underwater metals on your vessel.

Key Features:

  • 150 Amp output at 12 volts for high-capacity battery charging
  • 604 Series heavy-duty marine alternator platform
  • 4-inch dual foot saddle mount (J-180-style) for secure engine installation
  • K6 serpentine pulley included for modern belt drive systems
  • Isolated ground design for corrosion protection in marine environments
  • Compatible with Caterpillar, Cummins, Detroit Diesel, and John Deere marine engines
  • Designed for use with Balmar's external multi-stage regulators (e.g., MC-618) for optimized charging

The Balmar 604-150-K6 is engineered to pair with Balmar's external voltage regulators for smart, multi-stage charging, extending battery life and maximizing charging efficiency on extended passages. It is the preferred choice of offshore sailors and powerboat owners who demand reliable, high-output DC power generation.

Products specifications

Dimensions

5.35" (136 mm) Diameter x 5.08" (129 mm) Length x 7.5" (190 mm) Height

Mount Type

Dual Foot 4"

Type

Alternator

Voltage

12 Volts DC

Outputs

1 Output

ISO Approved

USCG Title 33ISOSAECE Compliant

Pulley Groove Type

Serpentine Groove

Pulley Outside Diameter

2.45 Inches

Rated Output Power - 2000 RPM Hot

65 Amps

Rated Output Power - 6000 RPM Hot

129 Amps

Warranty Details

One Year Limited Warranty against Defects in Material or Workmanship

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