This MechMan Marine certified Large Case H.O. 250 amp 6 phase alternator is a great upgrade for marine engines using the popular GM truck bolt pattern alternator on many different modern LS / LT series GM marine V8 engines. The alternator comes with a...

  The Elite series Large Case 250 amp alternator offers great amperage output and durability. 6 phase technology, combined with massive twin rectifier assemblies and 12 huge diodes make these alternators totally durable for daily driving and...

  The Elite series Large Case 250 amp alternator offers great amperage output and durability. 6 phase technology, combined with massive twin rectifier assemblies and 12 huge diodes make these alternators totally durable for daily driving and...

S Series 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...

The Elite series offers the highest possible amperage and durability available in a large case alternator. 6 phase technology combined with massive twin rectifier assemblies and 12 (80) amp diodes makes these alternators totally durable for daily use...

The Elite series offers the highest possible amperage and durability available in a direct bolt in alternator. 6 phase technology combined with massive twin rectifier assemblies and 12 huge press fit diodes makes these alternators totally durable for...

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 of power produced than conventional 3 phase alternators. 12 diodes, twin rectifier plates and...

S Series 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 of power produced than conventional 3 phase alternators. 12 diodes, twin rectifier plates...

S Series 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 of power produced than conventional 3 phase alternators. 12 diodes, twin rectifier plates...

E Series This Elite series racing alternator offers the highest possible low RPM amperage and durability. 6 phase technology combined with massive twin rectifier assemblies and 12 diodes makes these alternators totally durable for daily use, and retain...

Installation Notes:       The 240 amp E series alternator for Ram pickup with Hemi engines is a direct bolt-in replacement for the OEM alternator, and cranks out over 200+ amps at engine idle RPM, with 250+ amps at cruising speed. This...

Installation Notes: This unit comes equipped with a smaller 1.75 inch diameter alternator pulley, and will require a slightly shorter drive belt for proper belt tension.  Not recommended for sustained use above 5,000 RPM engine speed...