1963–1966 Chevrolet & GMC Truck Wiring Harnesses
Give your mid-sixties Chevy or GMC pickup the reliable electrical system it deserves with the Painless 19-Circuit Classic Customizable Harness. Designed for the 1963–1966 C10, C20, and C30 trucks, this kit delivers factory-style fitment, modern safety, and simplified installation—so you can spend more time driving and less time diagnosing wiring gremlins.
Every wire follows GM color codes, is printed every 12 inches for quick reference, and comes pre-terminated for the most common factory components, including headlight switch, ignition, dimmer switch, and wipers. Whether you’re working on a short-bed shop truck or a long-bed hauler, this harness offers the length and flexibility to fit your build perfectly.
Why Choose Painless for Your 1963–1966 Chevy or GMC Truck
Designed specifically for ’63–’66 C10, C20, and C30 pickups
Includes most factory connectors pre-installed out of the box
Color-coded and labeled wires make troubleshooting simple
Long wire lengths cover short or long-bed configurations
Modern fuse block with blade fuses—no fragile glass styles
Compatible with HEI ignition or standalone EFI conversions
Backed by the Painless lifetime guarantee and U.S. tech support
19-Circuit Classic Customizable GM Truck Harness (P/N 10112)
The Painless 19-Circuit 1963–1966 GM Truck Harness was designed to be a direct-fit upgrade for your factory wiring, with many connectors already installed out of the box. Each harness includes factory-style sockets for dash lights, warning lights, wipers, and headlights, plus open circuits for custom accessories and upgrades.
Engineered for carbureted or standalone EFI systems, this harness supports both traditional and modern ignition setups. Whether you’re restoring a stock 1965 C10 or building a custom restomod GMC, this kit ensures reliable performance and a clean installation.
Key Features:
19 total circuits / 12 fuses with horn relay and maxi fuse
Factory-fit design for 1963–1966 Chevrolet & GMC trucks
GM color-coded and labeled wiring for easy installation
Pre-terminated connectors for key components (headlights, dimmer, ignition, wipers, etc.)
Works with single or dual dash turn signal indicators
Extended wire lengths for single-cab or crew-cab long-bed applications
Compatible with carbureted or EFI setups
Includes Circuits For:
A/C & Heat, 4WD Switch, Brake Lights, Charging, Dome Light, Electric Choke, Emergency Flashers, Fan Relay Power, Fused Power Source, Headlights, Horn (Relay), Ignition Coil, Instrument Lighting & Gauges* (Fuel, Generator, Oil, Temperature), Park Lights, Radio/Clock, Starting, Tail Lights & License Plate, Turn Signals, and Wipers.
Connections Included:
Wiper motor, dimmer switch, brake switch, wiper switch, headlight switch, horn, alternator, dash light sockets, and warning light sockets.
Perfect For:
Owners wiring a 1963–1966 Chevrolet or GMC C/K truck who want a plug-and-play factory-style harness with modern fuse protection, clean routing, and upgrade potential for future accessories.