Description
Balmar Sterndrive Alternator 120 AMP 12V 1-2″ Single Foot Spindle Mount J10 Pulley w/Isolated Ground – Marine Boat Replacement Part is organized for ignition & electrical engine parts shoppers who need a clear, professional marine parts buying experience.
Alternator 120 AMP 12V 1-2″ Single Foot Spindle Mount J10 Pulley with Isolated Ground Alternator, 621 Series, 120A, 12V, Spindle Mount (Single Foot), 1-2in, J10 AltMount Serpentine Pulley, Isolated Ground 1″ Motorola-Style Mounting. Typical for Westerbeke, Lehman, Hino & Pathfinder Engines 2″ Delco-Style Mounting; Typical for Volvo Penta (Gas & Diesel), John Deere, Perkins, Mercruiser, Pleasurecraft, Crusader, Indmar, Marine Power & other GM-based Engines. Replaces: 621-120-SR-IG This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.
Fitment & Product Details
- Brand / Manufacturer: Balmar, Volvo Penta, MerCruiser
- Application: Sterndrive Parts
- Voltage: 12V
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- Verify compatibility with your original part number, engine model, and application before ordering.
- Built for boat owners, e-commerce shoppers, and professional marine service teams.






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