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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.VUP models: Fit engines using a 1" or 2" single foot (spool) mount for many 4.3-5.7L Mercruiser, Volvo Penta, Pleasurecraft, Crusader & other GM gas, Volvo, Cummins, Yanmar 6LP, Westerbeke diesels with Delco & Motorola-equipped alternators.