Bring dependable power and clean performance back to your engine bay with a high-quality 1966 Ford Mustang underhood wiring harness. This essential component connects and routes the electrical system under the hood, powering vital functions like headlights, ignition, voltage regulators, horns, and more. Over the years, factory wiring can degrade due to heat, corrosion, or fraying, leading to frustrating malfunctions or potential safety hazards. Our premium underhood harnesses are built to original specifications, offering factory-correct connectors and color-coded wires for easy, hassle-free installation. Whether you're performing a full restoration or updating worn wiring, this harness ensures your Mustang’s underhood electrical system runs safely and efficiently—just like it did in 1966.