Holley Terminator X Motorsport Wiring Loom

Motorsport-grade ETFE (MIL-W-22759/16) wiring loom engineered specifically for the Holley Terminator X Engine Control Unit.

This wiring loom is designed for builders who require a reliable, professional-grade electrical foundation for a Holley Terminator X–controlled engine. Hand-built using MIL-W-22759/16 motorsport-grade ETFE wire, it is intended for performance street and motorsport applications where heat, vibration, and electrical noise are part of the operating environment.

The Holley Terminator X ECU is widely used in performance and competition builds, and this loom removes the compromises commonly found in universal or automotive-grade wiring.

Designed Specifically for Holley Terminator X

This loom is pinned exclusively for the Holley Terminator X ECU. Every circuit is allocated correctly for the ECU’s engine management inputs, outputs, power supply, and CAN communications — with no universal pinouts, repurposed circuits, or guesswork.

The result is a clean, predictable wiring system that supports stable ECU operation, accurate sensor data, and long-term reliability.

Built Using Motorsport-Grade ETFE Wire (MIL-W-22759/16)

MIL-W-22759/16 ETFE wire was originally developed for aerospace and military applications and is ideally suited to performance street and motorsport environments.

Key benefits include:

• Excellent resistance to heat, fuels, oils, and automotive chemicals

• Thin, lightweight insulation for compact, tidy looms

• High durability under vibration and continual movement

• Reduced risk of insulation degradation over time

This wire is selected for reliability — not cost.

Terminated or Unterminated Options

This Holley Terminator X loom is supplied in an unterminated (flying lead) configuration as standard, allowing complete flexibility for engine layout, sensor selection, and routing.

A pin placement sheet showing wire numbers is available to download to assist with installation.

Custom terminations, wire lengths, and additional provisions can be discussed prior to ordering if required.

Suitable Applications

This loom is suitable for:

• Performance street vehicles

• Track and competition builds

• Engine swaps and custom conversions

• Naturally aspirated and forced induction engines

• Professional workshops and performance fabricators

This is not a vehicle-specific plug-and-play harness. It is intended for custom installations where control, reliability, and electrical integrity matter.

What’s Included

• Holley Terminator X ECU connector(s)

• Pre-wired ETFE (MIL-W-22759/16) wiring loom

• Built to order and quality checked prior to dispatch

Sensors, actuators, and the ECU are not included.

Built to Support Proven Holley EFI Systems

The Holley Terminator X ECU is a versatile and widely adopted engine management platform. This loom is designed to support it properly — without shortcuts, compromises, or unnecessary complexity — while maintaining motorsport-grade wiring standards.

Legal Notice

Holley® is a registered trademark of Holley Performance Products, Inc. This product is not affiliated with or endorsed by Holley.