250 Amp RVC Bypass Alternator - 2007-2026 6.6L Duramax LMM/LML/L5P & 2014-2019 GM Gas

250 Amp High Output Alternator for 2007-2026 6.6L Duramax LMM/LML/L5P

Fits the 6.6L Duramax across the LMM, LML and L5P engines in Chevrolet and GMC HD trucks, and the 2014-2019 GM gas trucks and SUVs that share the same case and two-pin RVC plug. 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 250+ 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 codes covered: LMM, LML, L5P

Vehicles: Silverado Sierra 2500HD 3500HD, Tahoe, Suburban, Yukon, Escalade

Manufacturer specifications and full fitment

NEW! - The cast housing Elite series alternator offers the highest possible amperage and durability available in a large case alternator. 6 phase technology combined with massive twin rectifier assemblies and 12 diodes makes these alternators totally durable for daily use, while still maintaining great output: 180 amps at engine idle speeds and a full 250 at cruising speeds. This unit comes with an OEM diameter pulley, making it perfect for high RPM and racing use and uses stock belt length.

*** THESE ARE NOT COMPATIBLE WITH EXTERNAL REGULATORS. YOU MUST REQUEST EXTERNAL REGULATION WHEN ORDERING. ***