Collection: Electrical - Alternators

Generate dependable power while underway.

Explore marine alternators and charging solutions designed to support dependable battery charging and onboard electrical systems while your engine is running.

Shop marine alternators, high-output alternators, alternator charging components, voltage regulation equipment and installation accessories for sailboats, powerboats, yachts and other marine applications.

Whether you're replacing an existing alternator, upgrading charging capacity or building a more capable onboard battery system, Roam & Harbor makes it easier to find marine charging equipment for your vessel.

From starting batteries to house battery banks, the right alternator and charging components can play an important role in maintaining reliable onboard power throughout your journey.

Charge underway. Power the journey.

120 products

  • Save $18.76 USD
    ARCO Marine

    ARCO Marine Premium Replacement Universal Alternator w/Single Groove Pulley - 12V 55A [60075]

    Regular price $279.99 USD
    Sale price $279.99 USD Regular price $298.75 USD

    Premium Replacement Universal Alternator with Single Groove Pulley - 12V 55AReplacement alternator that will fit Yamaha, Marine Power, Crusader, Replaces Motorola, 12 Volt, 55 Amp, Internal...

  • Balmar

    Balmar Pulley Kit f/Yanmar 2GM20-F, 3GM30-F, 3GM-F [48-YSP-3GM-B]

    Regular price $689.49 USD
    Sale price $689.49 USD Regular price $0.00 USD

    Pulley Kit for Yanmar 2GM20-F, 3GM30-F, 3GM-FAltMount® Serpentine Pulley Conversion Kit for Yanmar Diesel EnginesYanmar Engines Covered: 3GM30-F, 3GM-FKit Includes: Three Ten-Groove (J10) Pulleys, Two J10, 40″...

  • Save $152.00 USD
    Balmar

    Balmar Alternator 250 AMP 12V 3.15" Dual Foot Saddle J10 Pulley [XT-DF-250-J10]

    Regular price $1,251.99 USD
    Sale price $1,251.99 USD Regular price $1,403.99 USD

    Alternator 250 AMP 12V 3.15" Dual Foot Saddle J10 PulleyAlternator, XT Series, 250A, 12V, Saddle Mount (Dual Foot), 3.15in, J10 AltMount Serpentine Pulley, Case GroundHitachi-Style Mounting;...

  • Balmar

    Balmar Alternator Protection Module APM24 - 24V [APM-24]

    Regular price $110.29 USD
    Sale price $110.29 USD Regular price $0.00 USD

    Alternator Protection Module APM24 - 24VAlternators can be subjected to voltage spikes caused by lithium battery shutdowns, intermittent connections, and other over-voltage events.  Balmar has introduced...

  • Save $161.70 USD
    Balmar

    Balmar Alternator 1-2" Single Foot K6 Serpentine Pulley Regulator Temp Sensor - 170A Kit - 12V [XT-SF-170-K6-KIT]

    Regular price $1,328.99 USD
    Sale price $1,328.99 USD Regular price $1,490.69 USD

    Alternator 1-2" Single Foot K6 Serpentine Pulley Regulator & Temp Sensor - 170A Kit - 12VBalmar offers a wide range of alternator power upgrades designed specifically...

  • Save $124.00 USD
    Balmar

    Balmar Alternator 1-2" Single Foot J10 Serpentine Pulley - 170A - 12V [XT-SF-170-J10]

    Regular price $1,019.99 USD
    Sale price $1,019.99 USD Regular price $1,143.99 USD

    Alternator 1-2" Single Foot J10 Serpentine Pulley - 170A - 12VBalmar offers a wide range of alternator power upgrades designed specifically for marine industry applications. Balmar...

  • Save $42.90 USD
    Balmar

    Balmar Alternator 100 AMP 12V 1-2" Single Foot Spindle Mount K6 Pulley w/Isolated Ground [621-100-K6]

    Regular price $793.99 USD
    Sale price $793.99 USD Regular price $836.89 USD

    Alternator 100 AMP 12V 1-2" Single Foot Spindle Mount K6 Pulley with Isolated GroundAlternator, 621 Series, 100A, 12V, Spindle Mount (Single Foot), 1-2in, K6 Serpentine Pulley,...

  • Balmar

    Balmar Temp Sensor Battery - 30 [MC-TS-B30]

    Regular price $66.19 USD
    Sale price $66.19 USD Regular price $0.00 USD

    Temp Sensor Battery - 30'Temperature Sensor, Battery - 30' LengthThis product may not be returned to the original point of purchase. Please contact the manufacturer directly...

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