1966–1977 Ford Bronco Wiring Harness
The first-generation Ford Bronco is one of the most iconic 4x4s ever built—and with a Painless Performance Direct-Fit Chassis Harness, it can finally have an electrical system that’s just as dependable as its reputation. Designed in collaboration with early Bronco enthusiasts, this 28-circuit wiring harness delivers factory fitment, modern protection, and the flexibility to handle carbureted or EFI powertrains.
Every wire is color-coded to original Ford standards and printed with its circuit identification, making installation and future service straightforward. Most factory connectors are pre-terminated, and the kit includes a weatherproof fuse block mounted in a molded glove box—a clever upgrade that replaces the stock cardboard box while providing easy fuse access. From stock restorations to fully customized trail rigs, this harness is the ultimate electrical foundation for your classic Bronco.
Why Choose Painless for Your Bronco Build
Designed specifically for 1966–1977 Ford Broncos
Features 23 fused circuits and a horn relay for total system protection
Factory Ford color-coded and printed wires for easy identification
Includes a molded plastic glove box with a weatherproof fuse block
Pre-terminated factory connectors for plug-and-play installation
Compatible with carbureted or standalone EFI engines
Comes with an 80+ page full-color manual with diagrams and photos
Lifetime warranty and U.S.-based technical support
The Painless 28-Circuit Direct-Fit Harness transforms your early Bronco’s wiring into a modern, reliable, and easily serviceable system. With printed wire tags, OEM-style molded connectors, and a detailed instruction manual, this kit ensures professional-grade results even for weekend builders. Each harness includes all the necessary Ford-specific terminals and connectors for your ignition switch, wiper motor, headlight switch, hazard flasher, and more.
Key Features
28 total circuits / 23 fuses with horn relay
Factory-fit design for 1966–1977 Ford Broncos
Includes molded exterior light and turn-signal connectors
Weatherproof fuse block integrated into glove box
Ford color-coded and printed wiring for simple installation
Works with carbureted or EFI engines
Modern mini blade and maxi fuse protection
Printed wire tags on all connectors for clarity
Includes Ford-style dimmer, hazard, and wiper switch connectors
Includes Circuits For
A/C & Heat, Accessory #1–#9 (constant and switched), Backup Lights, Brake Lights, Charging, Cigarette Lighter, Dome & Courtesy Lights, Electric Choke, Emergency Flashers, Fused Power Source, Headlights, Horn (Relay), Ignition Coil, Instrument Panel Lighting & Gauges* (Ammeter, Brake Warning Light, Fuel Gauge, Fuel Tank Switch, Gear Indicator, Oil Gauge, Tachometer, Temperature Gauge, Voltmeter), Park Lights, Radio/Clock (Constant & Switched), Starting, Tail & License Plate Lights, Turn Signals, Wipers, and Washer Pump.
Perfect For
Owners restoring or upgrading a 1966–1977 Ford Bronco who want a plug-and-play wiring solution that blends OEM appearance with modern reliability. Ideal for classic restorations, restomods, and off-road builds that demand robust, color-coded wiring and modern fuse protection — built Painless, built to last.