XS Power BIG3RD Kit
Many in-stock orders ship within 1-2 business days, but timing varies by item. Custom, built-to-order, oversized, special-order and supplier-direct products may need extra processing time. Free shipping applies to qualifying orders over $99 in the contiguous US. Approved returns may be subject to a restocking fee.
Most products are covered by the manufacturer's warranty against defects. Damage from over-powering or improper installation isn't covered — we'll help coordinate any valid claim.
Tell us your vehicle, subwoofers and electrical setup and our team will help you match the right gear. Reach out before you buy.
The XS Power BIG3RD Kit is everything you need to complete a proper big 3 upgrade on your vehicle in one box. Upgrading the three critical charging system cables — ground to chassis, ground to engine block, and alternator positive — is the single most impactful wiring improvement a car audio installer can make, and this kit delivers that upgrade with quality high current power wire sized for real amplifier installs.
The Foundation Every Car Audio System Deserves
Before you drop money on a second battery or a bigger alternator, do the big 3. The BIG3RD Kit provides premium battery cable runs and matched terminations so your charging system can actually deliver the current your amplifiers demand. Cleaner grounds mean lower noise floor, tighter bass, and less voltage sag during hard hits — the results are immediate and unmistakable on any amp wiring kit-equipped system.
Authorized XS Power dealer at JS Ultimate Sounds. Free shipping on orders $99+.
PROP 65 WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm. Wash hands after handling.
For more information, visit www.P65Warnings.ca.gov
