Mechman Competition Large Case 400 Amp Alternator for GM Truck 1996 - 2025

Introducing the Mechman Alternators Competition Series - Built for Performance, Built in the USA!

Are you tired of subpar electrical performance holding you back when competing? Need adjustability? Look no further! Our Competition Series is designed to deliver top-notch power and reliability, perfect for high-demand applications and dialing in your voltage specific to your battery requirements or changes with different builds.

No complicated external regulator needed, use the included Mechman voltage controller for easy adjustments from 12.5v - 16.5v!

Please Note: This Competition Series may or may not create a battery light warning indication on the vehicle but it will make all the power and voltage you need for a true competition ready setup.  Can be used on all standard 12 and 14 volt AGM batteries and all lithium chemistry batteries where charging voltage range is between 12.5 and 16.5 volts. Consult with your battery manufacturer for optimal performance.

Key Features:

• Engines supported include 4.3L, 4.8L, 5.0L, 5.3L, 5.7L, 6.0L Vortec, as well as select 6.6L Duramax and 8.1L models (**Not compatible with stretch belt applications in some 2018-2025 models**)
• Exceptional Power Output: Provides over 200 amps at idle and a full 400 amps at cruising speed for unmatched electrical support.
• Heavy-Duty Construction: Built with 6-phase technology, dual internal rectifiers, and 12 oversized diodes to ensure durability and consistent performance.
• Easy Installation: Bolt-in design for seamless integration on OEM brackets or multiple bracket setups
• Adjustable Voltage: User-adjustable voltage controller for optimal performance (12.5-16.5V) with a simple 2-wire hook up
• Proudly Made in the USA: Built with American pride and a commitment to quality
• Great for factory bracket single alternator installs or as standalone multiple alternator setups running different voltages

Not for use with:

• Novice / first time high output alternator users
• High RPM racing applications
• Customers concerned about charging light indicators

 Order Now and Get:

•  2-year standard performance guarantee
• 1 year, 2 year and Lifetime extended warranty options available

**Not compatible with stretch belt applications in some 2018-2025 models.