Description:

The Mechman 48‑Volt Idle Max Alternator (GM Vortec LiFePO4), paired with the Mechman Dual Bracket Kit (1999‑2013 GM 4.8/5.3/6.0), gives you a powerful and reliable dual charging setup for your GM truck. The Idle Max alternator includes a Wakespeed WS500 external smart regulator that’s tuned for LiFePO4 battery banks, delivering up to 50 A (2,600 W) at idle and up to 100 A peak. It’s built in a GM Vortec-style housing, making it compatible with many aftermarket brackets. The dual bracket kit provides a zinc-coated bracket assembly, idlers, and spacers engineered for perfect belt alignment, maximum wrap, and minimal fatigue — all while retaining access to your power steering reservoir for easy servicing. Together, this system is ideal for overland, RV, off-grid, or high-demand vehicle applications where dependable 48-volt charging at idle is critical.

48-Volt Alternator | B11480100-EXT-LFP:

This alternator comes complete with a Wakespeed WS500 external smart regulator, providing adaptive charging control and simplified integration. Optimized for AGM battery banks, it is preprogrammed for simplified installation while still allowing customization. The GM Vortec-style frame provides easy fitment in multiple aftermarket bracket applications. Due to its slightly increased housing size, customers must confirm there is adequate clearance for installation before purchase.

This alternator shines in overland and RV builds where dependable AGM charging is needed at idle, in commercial/industrial equipment where electrical demands are constant, and in emergency backup systems that require charging confidence without revving the engine. Built to handle tough duty, it’s a go-to choice when reliability and performance matter most.

• Fits: GM Vortec & Duramax trucks as well as aftermarket dual bracket kits designed for GM Vortec alternators.
• Direct-Fit Design: GM Vortec mount ensures compatibility with many aftermarket brackets.
• High-Output Ready: Produces up to 50A (2,600 watts) at idle and up to 100A peak output for maximum efficiency.
• Includes: Alternator preprogrammed with a generic AGM charge profile for use with battery banks 100Ah or larger.
• Complete Kit: Supplied with a Wakespeed WS500 external smart regulator for precise, adaptive charging control.
• 27ft Wiring Harness Included: Provides flexibility for longer runs and custom installs.

Note: This alternator is supplied with an 8-groove, 50mm pulley. If using a belt with fewer than 8 grooves, the belt must be aligned with the inward grooves closest to the alternator face. Because of the high power these units produce at idle, some smaller engines may require our 6-groove underdrive pulley for proper operation.

⚠️ Customer Responsibility: Customers must be running a battery bank of at least 100Ah. It is critical that the customer confirms the generic profile matches their battery requirements. Refer to the image below and your battery manufacturer’s specification sheet before installation. Mechman will not be responsible for issues caused by a mismatch. Adjustments can be made through the Wakespeed app if required.

Braket Kit:

After years of research and revisions, and thousands of miles of real-world testing, Mechman is proud to offer the most complete and functional dual alternator system available for 1999-2013 GM LS truck engines. This kit is designed with function and durability in mind with maximum belt rap, and perfect belt alignment for minimized belt slip and belt fatigue. We have also engineered the system such that you still have easy access to your power steering pump reservoir for fluid service. These kits come complete with alternator(s) and belt to take all the guess work out of the installation. Our highly detailed color instructions ensure a quick install, possible with standard hand tools. Mechman dual alternator kits include large case 6-phase elite series alternators, featuring massive twin rectifiers with 12 huge diodes for maximum durability in daily driven vehicles.

Note: This kit is intended for use with your factory alternator only in its original spot. The belt included has been appropriately sized for this.

Fitment Guide: