ECU & Wire Harness Unterminated

The ECU & Wire Harness Unterminated by HOLLEY is an essential component for serious engine builders and tuners who demand complete control over their vehicle's fuel and ignition systems. This harness is designed for custom applications where factory wiring no longer suits your modified powerplant, allowing you to route, terminate, and configure every connection to match your specific engine bay layout and performance requirements.

The unterminated harness design provides unmatched flexibility in custom fabrication, enabling you to control wire routing, connector placement, and termination points. It is engineered for compatibility with HOLLEY's industry-leading ECU platform, ensuring clean signal transmission and minimal electrical noise. This design approach eliminates pre-molded connectors that may not align with your custom firewall penetrations, facilitating precision installation in tight engine bays.

Professional engine builders, standalone EFI conversion specialists, and high-performance fabricators rely on this harness for full-custom fuel and ignition management systems. Whether you're constructing an LS swap or a supercharged stroker, this harness provides the foundation for precision engine management without compromise. Its versatility makes it a vital tool for anyone looking to achieve optimal performance in modified vehicles.