Restore lost power and unlock better electrical performance with the ToyotaCables Big 7 Battery Cable Upgrade Kit. Designed to replace worn, undersized factory wiring, this kit improves current flow for faster starts, stronger charging, and cleaner, more reliable power delivery. Unlike a basic “Big 3,” the Big 7 upgrades additional high-load circuits—creating a better-than-factory electrical foundation that supports today’s needs and tomorrow’s upgrades.
Important Note
System Upgrade: Expands beyond the traditional Big 3 by upgrading up to seven critical power and ground paths
Performance Benefit: Reduces voltage drop to improve starting response, charging efficiency, and electrical stability
Material Quality: Built using SAE-approved fine-strand pure copper cable—no CCA
Future Ready: Supports stock systems now and higher-draw accessories or upgraded alternators later
Installation Ease: Pre-terminated, pre-labeled cables with military-style battery connections
What’s Included (Big 7 Explained)
Alternator Lead: Alternator output to battery positive
Battery Ground: Battery negative to frame/body
Engine Ground: Engine block to frame/body
Starter Lead: Battery positive to starter
Fuse Box Lead: Battery positive to fuse/relay box
External Fuse: ANL fuse added to safely manage increased current
Fuse Holder: Dedicated holder prevents routing high current through factory wiring
Specifications
Cable Material: SAE-approved fine-strand pure copper
Terminal Ends: Solid copper lugs crimped with electromechanical precision
