Big7Kits Big 7 Battery Cable Kit for 4Runner (1984-1989)

The Big7Kits Big 7 Battery Cable Kit is a complete electrical system upgrade designed to replace old, worn-out factory battery cables on early 4Runner platforms. Decades of heat, corrosion, and environmental exposure take a toll on factory wiring—this kit restores proper current flow for stronger starts, improved charging, and more reliable electrical performance.

This isn’t just a basic “Big 3” upgrade. It’s a true Big 7, engineered to exceed factory capabilities and prepare your 4Runner for future electrical demands.

Important Note

• Big 7 upgrade: Improves current capacity for alternator output, battery grounds, starter, and fuse relay circuits.
• Beyond Big 3: Includes additional leads for the starter and fuse relay box, plus an external fuse to avoid overloading factory wiring.
• Pure copper: Uses SAE-approved fine-strand pure copper cable—no copper-clad aluminum (CCA).
• Crimp quality: Solid copper lugs are crimped using an electromechanical crimping machine for maximum conductivity.
• Environmental seal: Marine-grade heat shrink meets MIL-I-23053/4 standards for corrosion resistance.
• Battery terminals: Includes military-style corrosion-resistant battery connections.
• Fuse protection: Includes ANL fuse and fuse holder for safe high-current routing.
• Ease of install: All cable ends are clearly labeled for straightforward installation.
• Alternator: Does not require a larger alternator—works perfectly with stock systems.
• Reliability: Helps resolve electrical issues caused by degraded factory wiring.

Why Upgrade to Big 7

• Starting power: Reduces voltage drop for faster, more consistent starts.
• Charging efficiency: Improves battery charging performance and stability.
• Electrical reliability: Eliminates many common electrical gremlins found in older vehicles.
• Future-ready: Prepares your 4Runner for accessories like winches, lights, inverters, or audio upgrades.

Cable Size Options

• 2 GA: Ideal for stock vehicles or mild electrical upgrades.
• 1/0 GA: Recommended if you plan to add accessories later and want to future-proof your system.

Specifications

• Cable material: SAE-approved fine-strand pure copper
• Insulation: Marine-grade heat shrink (MIL-I-23053/4)
• Terminals: Solid copper lugs with military-style battery connections

• Fuse type: ANL fuse with holder

Package Contents

• Cables: Big 7 upgraded battery cable set
• Terminals: Military-style battery connections
• Protection: ANL fuse and fuse holder
• Labeling: Pre-labeled cable ends for easy installation

Vehicle / Fitment

• Fits: Toyota 4Runner
• Years: 1984–1989
• Application: Factory battery cable replacement and electrical system upgrade