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Sky High Car Audio

Sky High Oversized 4 Gauge OFC Big 3 Upgrade RED/Black Electrical Wiring Kit - Improves Voltage Flow & Performance

  • Based on 355 reviews
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Availability: 16 left in stock
Fulfilled by TDR Product Supply
Arrives Saturday, Aug 29
Order within 21 hours and 23 minutes
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Color: Red/Black


Features

  • IMPROVES VEHICLE ELECTRICAL PERFORMANCE Upgrades the Big 3 connections to enhance power flow between battery, chassis, and alternator.
  • COST-EFFECTIVE CCA WIRE Copper-clad aluminum construction provides reliable conductivity at a more affordable price than OFC wiring.
  • REDUCES VOLTAGE DROP & DIMMING LIGHTS Helps stabilize voltage under load, improving amplifier performance and reducing power loss.
  • COMPLETE BIG 3 UPGRADE KIT Includes three 4-foot runs of 4 gauge wire with copper ring terminals and heat shrink for secure connections.
  • EASY INSTALLATION & FLEXIBLE DESIGN One end pre-terminated for convenience, allowing easier routing and a clean, professional install.

Description

Upgrade your vehicle’s electrical system with the Sky High Car Audio 4 Gauge CCA Big 3 Upgrade Kit, designed to improve power flow and overall system performance. Built with copper-clad aluminum (CCA), this kit offers a cost- effective solution for enhancing conductivity while maintaining reliable current delivery for everyday car audio setups. The Big 3 upgrade reinforces the three key electrical connections in your vehicle: battery ground to chassis, engine ground to chassis, and alternator positive to battery. Strengthening these connections helps reduce voltage drop, stabilize electrical output, and support consistent amplifier performance under load. Each kit includes three 4-foot runs of 4 gauge wire, with one end pre- terminated for easier installation and flexibility to customize fitment. Copper ring terminals and heat shrink provide secure connections and a clean, professional finish. Ideal for daily drivers and moderate power systems, this upgrade improves efficiency, reduces strain on your electrical system, and supports reliable car audio performance.

Color: Red/Black


Brand: Sky High Car Audio


Material: Copper


Number of Cable Strands: 1


Gauge: 4


Color: Red/Black


Strands: 1


Gauge: 4


Voltage: 12 volts


Number Of Wires: 4


Maximum Current: 300 A


Material Type: Copper


Brand Name: Sky High Car Audio


Manufacturer: Sky High Car Audio


Unit Count: 1 Count


UPC: 747150664804


Included Components: 4Gauge OFC Big 3 kit 3 cables, 6 terminals, heat shrink


Item Weight: 1.1 pounds


Model: SHA-BIG-4-RDBK-OFC


Part Number: SHA-BIG-4-RDBK-OFC


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Aug 29

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • 10/10
Color: Green/Black
does exactly what it's supposed to do. I kinda wanted a 0 gauge, or 2/0 setup, but at the time this was what I could afford, and was leaps and bounds better than stock. Shipping and installation was a breaze.
Reviewed in the United States on January 18, 2026 by Christian
    • Big 3 or nothing..
Review Image by Ambush
Review Image by Ambush
Sky High Wire Big 3 kits have made life easier for anyone who seeks the best performance for your automobile current + voltage needs. You are given enough POWER and GROUND wire plus the great brass welder rings to crimp on each end!! Whether you are installing an aftermarket audio system or you are just seeking overall performance upgrade from starting to idle. I have purchase 3 of these kits for 3 of my vehicles where I have added aftermarket audio systems. My car not only starts on a dime but there is no headlight blink or interior light quint while jamming!! I highly recommend these kits. ... show more
Reviewed in the United States on August 13, 2020 by Ambush
    • Big 3 upgrade
Color: Blue/Black
Used these cables for my big 3 upgrade and so far so good haven't had any issues and they are good quality cables
Reviewed in the United States on June 19, 2024 by jimmy
    • Very nice product
Color: Red/Black
No issues with quality, great bargain at this price. Only reason for 4 star, alternator to battery wire was just too short to route properly in engine bay. Had to run wire along radiator in front instead of with rest of harness.
Reviewed in the United States on June 5, 2020 by Paul F.
    • Best wires I found definitely worth it.
Color: Red/Black
This is the best 4 gauge wires I bought from Amazon by far. Works really well. This don't melt like some do. Thanks Amazon 🙂🙂
Reviewed in the United States on August 13, 2019 by A.Smith
    • Definitely recommend these.
Worked great, improved sound quality noticeably. However there were not enough Copper lugs and the wire seems to be just a little on the short side. Had to get creative to get it tucked and hidden but still functional.
Reviewed in the United States on May 21, 2020 by Chris
    • High quality
Color: Green/Black
Very nice quality kit with everything you need to upgrade your vehicles charging system easy to install lots of tutorials in youtube to help will need a crimping tool to install other end
Reviewed in the United States on September 21, 2021 by jayson
    • Best for the price.
Correct sizing. Good quality terminals. Heat shrink works great. More than enough length. I had enough ground left over to redo my amp ground wire.
Reviewed in the United States on December 20, 2018 by J Dunning

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