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The S Series of 6 phase alternators offers incredible output in a compact and durable package. Highly efficient, these units use less horsepower per kW than conventional 3 phase alternators. These units feature 12 diodes, twin rectifier plates and outstanding airflow to ensure long service life even in severe conditions. These units are available for a broad range of domestic and import applications in 170 or 240 amp configurations. The 170 amp S Series unit uses a stock diameter pulley, making it perfect for high RPM and racing use.