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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 240+ 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
Motor swap applications ONLY. This alternator comes with a single wire for 12v switched operation. This is perfect for moto swaps where the factory external regulator is not there or not desired.
The S series of 6 phase alternators offers incredible output in a compact and durable package. Highly efficient, these units use less horsepower than conventional 3 phase alternators. 12 diodes, twin rectifier plates and outstanding airflow ensure long service life, even in severe conditions. The 240 amp model offers the best balance between peak output, and output at engine idle RPM.
