Sky High Car Audio – BIG3 Wiring kit 100% OFC


The one-step “Big 3” upgrade kit


In stock (can be backordered)

In stock (can be backordered)



Sky High Car Audio, 1/0 AWG, 350A Big 3 Upgrade Kit

The one-step “Big 3” upgrade kit

If your aftermarket audio system is putting a strain on the rest of your car’s electronics, you might want to upgrade your factory wiring. Rated to 350 amps, this “Big Three” electrical upgrade package will boost your electrical system’s performance by allowing the maximum current to flow easily from your alternator, greatly improving the system’s ground connection to your vehicle’s chassis.

Sky High Car Audio kit includes heavy-duty 1/0-gauge oxygen-free copper cables that replace your vehicle’s battery ground-to-chassis wire, the chassis-to-engine block wire, and the alternator charge output wire. Another bonus is that the ring terminals are already crimped to the wires, so you won’t have to replace the stock grounds unless you want to improve them or double up.

Please note, each end of the cable has a pre-installed copper ring terminal and heatshrink.

Kit includes,

  • 1x 1.2m 1/0 AWG Sky High RED OFC Cable
  • 2x 1.2m 1/0 AWG Sky High BLACK Ground Cable
  • 6x Sky High Branded Heat Shrink (3 are pre-fitted)
  • 6x 1/0 AWG 100% Copper Crimp Terminals (3 are pre-fitted)
  • Installation Guide,

  • Step 1 Connect one of the two ground cables between the battery
    and a solid chassis ground. This cable can either replace the
    existing ground, or can be used in addition to the existing ground
  • Step 2 Connect the second of the two ground cables between the
    alternator ground stud and the chassis. If a ground stud is not
    available, using one of the rear alternator mounting bolts will also
    work the same.
  • Step 3 Connect the remaining power cable between the alternator
    and the battery, and keep clear of moving engine components and
    extreme heat items like the radiator, valve covers and exhaust
  • Step 4 Safely tie up and secure each individual cable with the
    zip ties and cable clamps (Not included)
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    Additional information

    Weight 3.5 kg


    UK Delivery

    All items ordered before 14.00pm are shipped the same day unless otherwise stated at the time of ordering. Orders placed after 14.00pm on a Friday will be shipped the following Monday (excluding bank holidays, in which case it will be the next working day). If the item is out of stock for whatever reason you will be emailed within 24hrs to inform you of this. Our site manages stock inventory so if it says ‘IN STOCK’ that means goods are available for immediate dispatch.

    • Shipping will be calculated at the checkout.
    • Free shipping available for customers in the UK mainland ONLY when orders are over £50.
    • We use Interlink Express for all UK next day deliveries (aswell as for orders over £50 if the weight exceeds 2kg) and Royal Mail Recorded Post for orders under 2kg.

    Make sure you supply us with a mobile number when you order, then we can give you full tracking information & updates on your order throughout the process.

    Clicking on the above image, will also allow you to track your order online. If you have any questions or queries, contact our helpful office team on

    Free Delivery

    Free delivery is available to UK mainland addresses ONLY and excludes addresses in the Scottish Highlands & Islands and Northern Ireland. Free delivery is applicable to orders over £50.00 (inc vat) ONLY. This offer doesn’t necessarily mean your goods will be sent on a courier next day service. However assuming the weight exceeds 2kg your goods are usually sent via courier (Interlink Express).

    Guranteed 24 Hour

    • Next Day Delivery – Over £50 Inc. VAT – Any weight – Free!
    • Next Day Delivery – 2-5KG – £8.00
    • Next Day Delivery – 5-20KG – £9.99
    • Next Day Delivery – 20-30KG – £11.99
    • Next Day Delivery – 30-40KG – £15.00
    • Next Day Delivery – 45KG+ – £50.00


    • Royal Mail 1st Class Recorded 1-3 working days – Upto 1KG – £4.45
    • Royal Mail 1st Class Recorded 1-3 working days – Upto 1-2KG – £6.90
    • Royal Mail 2nd Class Recorded 2-5 working days – 0-2KG – £3.95


    • Royal Mail Special Delivery Saturday – Upto 2KG – £14.00
    • Courier Saturday – Upto 5KG – £15.95
    • Courier Saturday – 5-20KG – £19.95
    • Courier Saturday – 20-25KG – £22.95

    Orders MUST be made before 2pm Friday

    Back Order

    Items that are listed with ‘Back order’ usually means there is around a 5-10 working day delay for the item to be back in stock. Some items are listed in this way as they are a low volume product and are considered special order with our suppliers.

    European & International Delivery

    Blade ICE ships internationally to many countries in Europe. Based on the weight of your order shipping will be calculated at the checkout.

    Blade ICE reserves the right to charge the full shipping fee applicable to resend if the item is returned to us as the customer was unable to take delivery of the parcel for any reason. Courier returned items will be added back into our stock and your account credited with the order total, minus the fee the courier charges us to deliver the item back to us. You will have to re-place the order to have the item reshipped. If a customer inputs any incorrect details on their order, which causes the parcel to be delivered incorrectly, we will not hold any responsibility for this parcel.

    Finally we advise you to check the contents of the order with the inventory sent with the goods. In the rare instance that goods are missing, please contact us within 24 hours and we will happily send out the missing goods at no extra cost to you. If goods are damaged or faulty please inform us within 3 working days of receiving your order.

    Please refer to our Terms and Conditions for more information.