Ignitions and Electrical› Wiring Components

XS Power

Big 3 Upgrade Kit

$129.99

SKU: BIG3RD

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The XS Power BIG3RD is a Big 3 upgrade kit designed to improve your electrical system's performance, especially when paired with a high-amperage alternator for car audio systems. This kit replaces or augments your vehicle's battery ground-to-chassis wire, chassis-to-engine block wire, and the alternator positive-to-battery positive terminal wire. It features heavy-duty 1/0-gauge copper-clad aluminum cables and includes pre-crimped 8.5 mm ring terminals, with extra connectors for customization.
Show original supplier description
The XS Power BIG3RD is a "Big 3" upgrade kit engineered to enhance your vehicle's electrical system, particularly when running high-demand car audio setups or high-amperage alternators. This kit addresses critical wiring points by replacing or augmenting the factory battery ground-to-chassis wire, the chassis-to-engine block wire, and the alternator positive output to battery positive terminal connection. Constructed with heavy-duty 1/0-gauge copper-clad aluminum cables, this kit ensures robust power delivery and improved current flow. The included 8.5 mm ring terminals are pre-crimped for convenience, and the kit provides extra terminals and connectors, allowing for custom length adjustments and terminal replacements. The package also includes essential accessories like heat shrink tubes, wire clamps, zip ties, and screws for a comprehensive installation. By upgrading these key connections, you can help prevent voltage drops and ensure your components receive stable power, leading to better overall system performance and reliability.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandXS Power
Part NumberBIG3RD
CategoryIgnitions and Electrical

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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