Collection: Alternators

Upgrading or replacing a marine alternator means matching several variables at once: system voltage, output amperage, mounting configuration, pulley type, and ground style. Both ARCO Marine and Balmar offer serious options here, covering 12V systems for conventional setups and 48V high-output units like the ARCO Marine Zeus A8000 line, which delivers 8kW and comes in a range of mount styles including Single Foot Spindle, J180 4-inch, N62, and 3.15 Common Rail configurations. Ground type matters too, as isolated ground and case ground versions are not interchangeable, so confirm which your engine uses before ordering.

Balmar rounds out the category with 120-amp alternators built for demanding charging systems, along with pulley kits sized for specific engines like the Volvo D2-55 series and offshore repair kits that include bearings, brushes, and regulator components. ARCO Marine also offers engineered outboard alternator kits for 12V applications. If you are replacing a failed unit, check your existing bracket style and belt setup carefully, as mounting geometry varies significantly across models.