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In this video Justin covers the basics of common alternators for midrange Cummins marine diesel engines. Frame sizes (0:18). Typical wiring including 1 wire vs 3 wire alternators (2:00). Excitation/ignition diodes (6:08). Diode battery isolators (7:03). Internally regulated alternators with AGM batteries (10:14). Lithium Batteries (12:20).