Dual Alternator Bracket Kit – 2014-2020 GM/Chevy Trucks (5.3L, 6.2L)
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Installation Instructions
Important: A Big 3 wiring upgrade is required for all high output alternators — factory wiring isn't rated for 250A+ output.
Before you start: Batteries fully charged, vehicle off and engine cool. Wear eye protection and remove loose jewelry.
Remove the old unit: Disconnect the negative battery cable, then the alternator wiring. Note the belt routing, remove the belt, then remove the bracket bolts and the factory alternator.
Install the new alternator: Mount it (factory bolts usually work) — hand-thread first, then torque to spec. Fit a serpentine belt about 0.5–1" shorter unless otherwise specified and confirm it's aligned in all pulley grooves.
Grounding: Clean all contact surfaces to bare metal and apply a corrosion inhibitor. On uni-body vehicles, ground to the thickest sub-frame metal and add ground cables if charging voltage is low. Keep wiring at least 12" from heat sources.
Regulator / plug: Factory plug — snap the harness into the regulator. Pigtail (single-wire) — excite wire (L) to a 7–15V ignition source, sense wire (S) to the alternator positive. Self-exciting (one-wire) — no plug; connect only B+ and ground (a battery light may appear). A dash volt gauge is recommended.
Finish: Complete the Big 3 upgrade, reconnect the negative terminal, start the vehicle, and confirm 13.5–14.8V at the battery.
Big 3 Wiring Installation
The Big 3 upgrade replaces the three main cables with 1/0 100% OFC (oxygen-free copper) wire: (1) alternator positive → battery positive, (2) engine/alternator ground → chassis, and (3) battery negative → chassis. Required for all high output alternators.
Before you start: Charge the batteries, vehicle off and cool, eye protection on. Disconnect the negative battery cable first.
Install: Run the upgraded positive cable from the alternator positive to the battery positive. Add an upgraded ground from the engine/alternator bracket to the frame, and another from the battery negative to the frame. Clean every contact point to bare metal and apply a corrosion inhibitor. Crimp and heat-shrink the lugs, then torque firmly.
Finish: Reconnect the negative terminal last. Two kit types are offered — Universal (most common) and Polaris Slingshot (longer positive cable for trunk-mounted batteries). Check the measurements for your vehicle before buying.
Upgrade your charging system and unlock serious power potential with our Dual Alternator Bracket Kit for GM LT truck engines. Designed for high-demand electrical setups, this bracket allows you to run a secondary alternator—perfect for car audio builds, overland setups, work trucks, and any application requiring increased output and reliability.
This product was developed from a proven dual alternator bracket design and refined for strength, fitment, and long-term durability.
Built for Performance & Reliability
- Dual Alternator Capability – Add a second alternator to support high electrical loads and help reduce voltage drop under demand.
- Heavy-Duty Construction – Built for strength and durability to handle vibration, load, and long-term use.
- Precision Fitment – Engineered for proper alignment, clean installation, and dependable belt tracking.
- Reinforced Design – Designed to maintain stability and consistent performance in demanding applications.
- Clean, Professional Finish – Finished for durability and a clean appearance under the hood.
Perfect for High-Demand Setups
This dual alternator bracket is ideal for vehicles running:
- High-output alternators
- Large car audio systems
- Off-road lighting and accessories
- Overland electrical setups
- Work truck power demands
If your build requires more charging capacity and greater electrical reliability, this bracket provides the foundation for a dependable dual alternator setup.
Fitment
Designed for GM LT-based truck and SUV applications with:
- 5.3L V8
- 6.2L V8
Common applications may include Silverado, Sierra, Tahoe, Suburban, Yukon, and Escalade models depending on engine configuration and setup.
What’s Included
- Dual alternator mounting bracket
- Required mounting hardware (if applicable)
Important Notes
- Belt length may vary depending on alternator configuration and pulley setup.
- Professional installation is recommended.
- Please verify fitment before ordering.
Why Upgrade to a Dual Alternator Setup?
Running a single alternator with high electrical demand can lead to voltage drop, reduced performance, and unnecessary strain on your charging system. A dual alternator setup helps distribute the load more efficiently, improve system stability, and support accessories that require serious power.
