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Fits the 5.9L Cummins in 1989-2002 Dodge full-size trucks, covering both the 12-valve 6BT and the 24-valve ISB. This is a direct bolt-in upgrade over the factory unit — same mount, same pulley position, no bracket modification.
Diesel engines spend most of their working life at low RPM, and that is exactly where a stock alternator runs out of headroom. This unit holds 200+ amps at engine idle and delivers a full 370+ amps at cruising speed, hot rated — enough for a lift pump, auxiliary lighting, a winch, a plow, a welder or a competition-grade stereo without watching your voltage sag at every stoplight.
Engine-swap version. This part number uses a single ignition-switched 12V wire to turn the alternator on and off, so it works in swapped chassis where the factory external regulator is gone or unwanted.
Engine codes covered: 12-valve 6BT, 24-valve ISB
Vehicles: Dodge Ram 2500 3500
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