This 12V marine alternator is a Recmar replacement for Volvo Penta petrol engines using a serpentine (multi-groove) belt drive. It cross-references Volvo Penta OEM 3857813 and is commonly found on GM-based Volvo Penta installations across the 3.0L–8.2L range. Confirm your engine model, belt type, and the part number on the unit currently fitted before ordering.

• Part: Alternator
• Voltage / Output: 12V, 55A
• Regulator: Internal
• Pulley type: Serpentine / multi-groove (groove pulley)
• Engine fitment (per supplier listing): Volvo Penta 3.0, 4.3, 5.0, 5.7, 5.8, 7.4, 8.2; V6 & V8 (Mando-type application)
• Cross-references: Volvo Penta 3857813, 3860082, 3860798; MerCruiser 807652, 807652T, 807652R01; OMC 3860082
• Aftermarket reference: Recmar REC3857813

Fitment note: Alternators can vary by belt system (serpentine vs V-belt), mounting, and wiring plug style. Always match the reference numbers and compare the replacement to the alternator removed from your engine.