This 12V 50A alternator is a direct replacement for select Mercury Marine / MerCruiser 3.0L applications that use a Delco 5SI-style alternator with a 4-groove serpentine pulley. It cross-references Mercury OEM 8M0064020 (and earlier numbers 875286A1, 881247A1, 889956) and is supplied by Recmar under SKU REC8M0064020.

Important: Fitment can vary by engine serial range and alternator style. This unit is specified as not a replacement for Nippondenso alternator applications.

• Part type: Marine alternator
• Output: 12V / 50A
• Style: Delco 5SI (internal regulator, internal fan)
• Pulley: 4-groove serpentine (approx. 50 mm OD, per interchange specs)
• Typical applications: Mercury/Mariner 3.0L EFI/DFI/Optimax outboards where OEM reference matches
• OEM cross-references: 8M0064020, 8M0033842, 875286A1, 875286T, 881247, 881247A1, 881247R01, 889956, 8M6013461
• Aftermarket reference: Recmar REC8M0064020

Before ordering, match your existing alternator part number and confirm your engine model/serial number to ensure the correct mounting, pulley, and connector.