Big 7 Battery Cable Kit

For 1984–1989 1st Gen Toyota 4Runner & 1984–1988 2nd Gen Toyota Pickup

Overview

This Big 7 Battery Cable Upgrade Kit is designed for 1984–1989 Toyota 1st Generation 4Runner and 1984–1988 Toyota 2nd Generation Pickup to replace aging factory wiring and improve overall electrical system performance.

Over time, original battery cables degrade due to heat, corrosion, and environmental exposure. This kit upgrades critical power and ground connections to restore reliability, improve current flow, and support both stock and modified electrical systems.

What Is the Big 7 Upgrade

The Big 7 system expands on the traditional “Big 3” electrical upgrade by increasing current capacity across all major power and ground connections in the vehicle.

This kit upgrades:

• Alternator to battery positive cable
• Battery negative to chassis ground
• Engine block to chassis ground
• Starter power cable
• Fuse and relay box power leads
• Additional fused power connection for improved load handling

An included external ANL fuse and holder helps manage increased current safely without overloading factory wiring.

Performance Benefits

Upgrading your battery cables improves electrical efficiency across the entire vehicle.

Key benefits include:

• Faster and more reliable engine starts
• Improved battery charging performance
• Reduced voltage drop across the system
• Increased reliability for aging electrical systems
• Support for accessories such as winches, lighting, and audio systems

This upgrade is beneficial for both stock vehicles and modified builds.

Premium Cable Construction

This kit is built using high-quality materials designed for long-term durability and performance.

Construction features:

• Pure copper, fine-strand SAE-approved cable
• No copper-clad aluminum used
• Solid copper terminals for maximum conductivity
• Precision crimped connections using electromechanical equipment
• Marine-grade adhesive-lined heat shrink for environmental sealing
• Corrosion-resistant military-style battery terminals

Each cable is labeled for straightforward installation.

Cable Size Options

Two cable sizes are available depending on your setup:

• 2 Gauge (2GA): Ideal for stock or lightly modified vehicles
• 1/0 Gauge: Recommended for vehicles running high-draw accessories or future upgrades

Choosing the correct size helps ensure proper electrical performance and system efficiency.

Installation Notes

• Designed as a direct upgrade to factory wiring
• No alternator upgrade required for installation
• Supports future electrical modifications
• Labeled cables simplify installation

What Is Included

• Complete Big 7 cable set
• ANL fuse and fuse holder
• Battery terminals
• Pre-labeled cables for installation