Early Bronco Wiring Harness

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Early Bronco Wiring Harness Options: What You Need to Know

If you’ve ever owned a vintage Bronco, you know factory wiring can be a major weak point. Whether you're dealing with cracked insulation, spliced-in trailer lights from the '80s, or a rat's nest behind the dash, the wiring on a 1966–77 Ford Bronco often needs a complete overhaul. The good news? Today’s replacement harnesses are better than ever—and there are now more great options than just Painless or American Autowire.

Let’s walk through the current lineup of Early Bronco wiring harnesses to help you decide which one fits your build, your budget, and your comfort level when it comes to installation.

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NEW: Classic Pre-Loomed Early Bronco Wiring Harness

For those who want modern dependability with classic functionality, our all-new Classic Pre-Loomed Early Bronco Wiring Harness might just be the perfect fit.

Unlike universal-style harnesses, this one is built specifically for the 1966–77 Bronco. It features a pre-loomed, pre-terminated design, which means wires are already bundled and routed into groups that follow the original layout of the Bronco’s electrical system. No guessing. No tedious wire runs. Just a clean, factory-style install that drastically cuts down on time and frustration.

This harness retains the original factory switch layout, making it an excellent option for OEM-style restorations or reliable drivers. It includes correct connectors, terminals, and wire colors—everything you need for a plug-and-play upgrade that respects the original design.

Why Choose It:

• Pre-loomed for ease and accuracy

• Works with factory switches and layout

• Cleaner install for stock or mild resto-mod builds

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Painless Performance Early Bronco Wiring Harness

The Painless wiring harness has long been a top-tier choice for Early Bronco owners looking to upgrade their electrical systems with flexibility in mind. This kit features a 28-circuit waterproof fuse block, extra circuits for accessories, and clearly labeled wires that make routing and troubleshooting easier.

This harness is ideal for those adding custom accessories like auxiliary lighting, aftermarket gauges, or power accessories. It does require reusing factory dash switches, but we include these if you opt for our master kit.

For best results, many builders add our wire loom kit for a clean, protected final install. This is also included in the master kit for ease of ordering.

Why Choose It:

• Great for custom builds and upgrades

• Extra circuits available for accessories

• Detailed instructions and labeled wiring

• Weatherproof fuse panel adds reliability

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American Autowire Early Bronco Wiring Harness

Looking to modernize your Bronco with A/C, aftermarket gauges, or EFI? The American Autowire harness was built for highly modified Broncos and includes brand-new switches for ignition, wipers, and dimmer. It’s engineered to support modern add-ons right out of the box.

If you’re going far beyond stock - say with a full custom dash or drivetrain swap - this harness gives you the flexibility and support you’ll need for a seamless install.

Why Choose It:

• Great for custom or modern builds

• Includes key switches and connectors

• Designed for popular aftermarket accessories

• Well-supported documentation and design

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Centech Early Bronco Wiring Harness (No Longer Available)

For years, Centech was the go-to harness for Bronco owners looking for a solid, cost-effective stock replacement. It earned a loyal following thanks to its quality construction and ease of use for OEM-style wiring layouts.

However, supply chain issues made it increasingly hard to find—and as of now, Centech wiring harnesses no longer appear to be available in the market. While it served the Bronco community well, most builders are now shifting to newer, more supported options like our Classic Pre-Loomed Harness or the tried-and-true Painless and American Autowire kits.

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Which One’s Right for You?

It all comes down to the type of Bronco you’re building and how much wiring complexity you're comfortable tackling.

• Restoring a mostly stock Bronco?
  The Classic Pre-Loomed Wiring Harness offers the cleanest install with OEM fit and finish.

• Planning a modern build with lots of add-ons?
  Go with Painless or American Autowire for more flexibility and accessory support.

• Want a middle-ground that’s easy but adaptable?
  Painless gives you room to grow without abandoning the original Bronco layout.

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Final Thoughts

Wiring a Bronco doesn’t have to be a nightmare. Whether you're going for a factory-correct restoration or a full-blown custom rig with EFI and power everything, WILD HORSES 4x4 offers a wiring solution that fits your build, your skill level, and your long-term goals.

And as always, if you’ve got questions—we’re Bronco people. We’ve wired our own rigs, tested every product we sell, and we’re here to help you get the job done right.

Clean power. Reliable starts. No smoke. That’s how we wire it.

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Early Bronco 66-77 Dash Layout Schematic