Professional Unterminated EFI Harness for FuelTech FT450 & FT550 ECUs

The FuelTech FT450 / FT550 Unterminated Wiring Harness (A Connector) is designed for builders and fabricators who want complete control over their EFI wiring layout. This harness provides a direct, OEM-style interface to the FuelTech ECU while leaving all conductors unterminated for fully custom engine and chassis wiring.

Ideal for motorsports, engine swaps, and clean-sheet EFI builds, this harness allows precise routing and integration without unnecessary adapters or extensions.

OEM FuelTech A Connector with Full Custom Wiring Control

This harness features a genuine FuelTech A connector that plugs directly into the FT450 or FT550 ECU, ensuring proper pin alignment, secure terminal retention, and long-term electrical reliability.

All wires exit the connector unterminated, giving you total flexibility to integrate sensors, power, grounds, and outputs based on your specific application.

Built for Standalone EFI & Motorsport Applications

The wiring used in this harness is suitable for EFI and motorsports environments where reliability, serviceability, and clean layout are critical.

Each conductor is printed with pin identification, streamlining the wiring process, reducing installation errors, and making troubleshooting significantly easier on complex builds.

Flexible Length for Clean ECU Placement

This unterminated harness is supplied in a 10-foot length, allowing flexible ECU placement in the cabin, trunk, or other remote locations. The added length supports clean routing without the need for splices or secondary extensions.

Ideal Applications

This harness is commonly used for:

• FuelTech FT450 standalone ECU installations

• FuelTech FT550 standalone ECU installations

• Custom EFI wiring from scratch

• Race cars and motorsports builds

• Engine swaps and custom chassis wiring

What’s Included

• 1× FuelTech FT450 / FT550 Unterminated Wiring Harness

• OEM FuelTech A Connector pre-installed

• Unterminated, labeled conductors for full customization

Installation Notes

This product is intended for advanced wiring projects. Proper ECU pinout references, open-barrel crimping tools, and professional wiring knowledge are required for installation.

Improper wiring may result in ECU or component damage. Professional installation is strongly recommended.

Fueltech Wiring Diagrams Here