47-55 Chevy/GMC Classic Update Wiring System

The 47-55 Chevy/GMC Classic Update Wiring System by AMERICAN AUTOWIRE is designed specifically for restorers and custom builders working on vintage Chevy and GMC trucks from the post-war era. This complete wiring harness system simplifies the process of updating the electrical system in classic 1947–1955 Chevy or GMC pickups, eliminating the risks associated with outdated original wiring.

Engineered for a seamless fit into first-generation Chevy and GMC frames, this harness features color-coded circuits that align with OEM routing patterns, which is essential for preventing shorts and voltage drops that are common in older wiring. It supports modern 12-volt negative-ground systems while preserving a period-correct appearance, allowing for upgrades to charging systems and ignition electronics without visible wiring clutter.

Ideal for frame-off restorations and custom builds, this harness is perfect for builders who prioritize safety and authenticity. Installation typically takes 6–10 hours for experienced mechanics, and detailed routing diagrams are included to assist in matching factory motor bay layouts.