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6-Series alternators and multi-stage voltage regulators deliver faster, safer charging for batteries ranging from standard flooded to AGM technologies. All Smart Ready 6-Series, small case alternators come standard with dual internal cooling fans, fixed voltage internal regulation, dedicated isolated ground, lamp circuit, and multi-position tensioning crown. Durable white powdercoat finish.YP models: Fit engines using a 3.15" ID dual foot (saddle) mount for many 6.2-8.1L Mercruiser, Volvo Penta, Crusader & other large block GM gas, Yanmar, Westerbeke, Perkins diesels with Hitachi-equipped alternators.Contact Balmar Technical Support with any application questions to confirm your specific engine/alternator configuration and appropriate belt/pulley.