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SKU #: BK-CDMX01-66-0G-XXRKS MPN #: CDMX01-66-0G-XXRKS

Big 7 Kits Battery Cable Kit 01-07 GM 6.6L Duramax LB7 / LLY / LBZ

$385.50
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Description
Restore dependable electrical performance in your Chevrolet or GMC 6.6L Duramax with the Big 7 Battery Cable Kit. Designed specifically for LB7, LLY, and LBZ-powered trucks, this complete replacement system eliminates aging, corroded factory wiring to help reduce voltage drop, improve cold starts, and deliver more consistent current to the starter, alternator, batteries, and electrical accessories. Each kit is constructed from 100% fine-strand, SAE-rated pure copper cable with a flexible J1127 jacket for excellent conductivity and long-term durability. Solid-copper terminals are secured using gas-tight electromechanical crimps rated for up to 700 pounds of pull force, then sealed with marine-grade heat shrink to help protect the connections against moisture and corrosion. This vehicle-specific Big 7 system includes replacement cables, corrosion-resistant military-style battery terminals, a MEGA fuse and fuse holder, and protective heat shielding or wrapping where required. Every cable end is clearly labeled to simplify installation and help ensure each connection is routed correctly. Cable Size: Choose 1/0-gauge or heavier 2/0-gauge pure copper cables Cable Finish: Available with Black / Ped, or Spyder-pattern protective sleeving High-Output Alternator Option: Adds larger cables for trucks equipped with a high-output alternator
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Restore dependable electrical performance in your Chevrolet or GMC 6.6L Duramax with the Big 7 Battery Cable Kit. Designed specifically for LB7, LLY, and LBZ-powered trucks, this complete replacement system eliminates aging, corroded factory wiring to help reduce voltage drop, improve cold starts, and deliver more consistent current to the starter, alternator, batteries, and electrical accessories.

Each kit is constructed from 100% fine-strand, SAE-rated pure copper cable with a flexible J1127 jacket for excellent conductivity and long-term durability. Solid-copper terminals are secured using gas-tight electromechanical crimps rated for up to 700 pounds of pull force, then sealed with marine-grade heat shrink to help protect the connections against moisture and corrosion.

This vehicle-specific Big 7 system includes replacement cables, corrosion-resistant military-style battery terminals, a MEGA fuse and fuse holder, and protective heat shielding or wrapping where required. Every cable end is clearly labeled to simplify installation and help ensure each connection is routed correctly.

  • Cable Size: Choose 1/0-gauge or heavier 2/0-gauge pure copper cables
  • Cable Finish: Available with Black / Ped, or Spyder-pattern protective sleeving
  • High-Output Alternator Option: Adds larger cables for trucks equipped with a high-output alternator
Vehicle Fitment
2001-2007 GM 6.6L Duramax LB7 / LLY / LBZ
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov

FEATURES & BENEFITS:

  • Fits Chevrolet and GMC 6.6L Duramax trucks
  • Compatible with LB7, LLY, and LBZ engines
  • Available in 1/0-gauge and 2/0-gauge configurations
  • 100% fine-strand SAE-rated pure copper cable
  • Flexible SAE J1127 cable jacket
  • Gas-tight electromechanical terminal crimps
  • Marine-grade heat-shrink protection
  • Corrosion-resistant military-style battery terminals
  • Includes a MEGA fuse and fuse holder
  • Labeled, vehicle-specific cables for easier installation
About Big 7 Kits

Big 7 Kits is a U.S.-based manufacturer specializing in high-quality battery cable upgrade kits designed to restore and improve vehicle electrical performance. What began as a solution to common starting and voltage issues has grown into a trusted brand serving enthusiasts and vehicle owners nationwide.

Built on a foundation of durability and real-world performance, each kit is engineered using premium materials such as fine-strand oxygen-free copper wiring, heavy-duty crimps, and marine-grade heat shrink. The brand name is inspired by its comprehensive “Big 7” cable upgrade system, delivering complete, easy-to-install solutions that outperform factory components.

With roots in the enthusiast community, Big 7 Kits continues to expand its lineup across platforms including Jeep, Ford Powerstroke, and Dodge Cummins, while maintaining a focus on American craftsmanship, reliability, and practical design.

Overall rating: 3.0 / 5 from 1 reviews.

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Better than stock

"Well the cables look great. The battery to battery cable was about 10 inches to short so I had to turn the drivers side battery 180 so I could use it. So then I had to extend other cables due to the battery change. Also had to change a couple battery clamps to a different style because the ones they sent didn’t work with some of the routing"

Henry H. (3/5)

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