SKU: PWI10112
UPC: 749823101128
MPN: 10112
The 63-66 GM P/U Wiring Harness by Painless Wiring is a complete 19-circuit solution engineered for classic Chevrolet and GMC pickup trucks from 1963 to 1966. This harness eliminates the factory's fragile, deteriorated original wiring and replaces it with a modern, reliable electrical backbone. Whether you're restoring a vintage truck to show-quality condition or building a restomod with period-correct aesthetics and modern performance, this harness is the foundation that lets you add fuel injection, upgraded ignition systems, auxiliary lighting, and sound equipment without compromise.
Painless Wiring's 19-circuit harness uses color-coded, insulated wiring and robust connectors designed to handle the electrical demands of period-correct engine bays while supporting modern upgrades. The 19-circuit design provides dedicated circuits for ignition, charging, lighting, wipers, cooling fans, and accessories—eliminating the daisy-chaining and undersized gauge wire found in original systems. At 11.6 pounds and measuring 10.4 x 5.3 x 14.5 inches when packaged, this harness is substantial enough to deliver full amperage capacity yet compact enough to route cleanly through a 1960s-era truck cab. The pre-assembled bundle reduces installation time significantly compared to piecing together vintage cloth-covered wiring, and modern terminals resist corrosion far better than original crimps.
Mechanics and restorers prefer this harness for trucks that will see street use, show events, or light off-road duty. Its compatibility with 1963–1966 GM full-size pickups (Chevrolet C10/K10 and GMC equivalents) makes it the ideal choice for anyone rebuilding the electrical system without gutting the original dash or firewall. Installation requires basic automotive knowledge and hand tools; detailed instructions and harness routing diagrams guide you through firewall penetrations, fuse block placement, and accessory connections. This harness pairs seamlessly with upgrading to a modern alternator, solid-state voltage regulator, or LED lighting while maintaining the truck's classic appearance.
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