Heavy Duty Headlight Conversion Harness w/Relays

Heavy Duty Headlight Conversion Harness – 1966–77 Bronco, 1961–86 Ford Truck & 1978–86 Bronco

Upgrade your classic Ford with this Heavy Duty Headlight Conversion Harness designed for 1966–77 Ford Broncos, 1961–86 Ford F-Series Trucks, and 1978–86 Full-Size Broncos. This harness improves lighting performance by replacing the weak stock wiring with heavy-duty wiring and relays, providing stronger, more stable power — especially when running high-output bulbs.

Enhanced Visibility with Dual Beam Function

The innovative design includes a pre-installed diode that allows both low and high beams to stay illuminated when the brights are on, delivering superior visibility in dark or low-visibility conditions. This feature ensures you have maximum lighting output whether you’re on the highway or the trail.

Built for Reliability & Easy Installation

Constructed from high-quality materials and built for durability, this harness is made to withstand years of use. An included installation schematic makes the process straightforward for both DIY enthusiasts and professional installers. With this harness, you’ll enjoy dependable performance and improved safety every time you drive.

Product Highlights

• Fits 1966–77 Ford Bronco
• Fits 1961–86 Ford F-Series Truck
• Fits 1978–86 Full-Size Bronco
• Heavy-duty wiring and relays for stable power output
• Pre-installed diode for simultaneous high & low beams
• Improves lighting with high-output bulbs
• Durable construction ensures long service life
• Includes schematic for easy installation