Haltech Nexus T1 T2 Harness – Premium Universal Wire-In Harness

Building a complete custom engine management installation around a Haltech Nexus T1 or Nexus T2 ECU? The Haltech Premium Universal Wire-In Harness gives you the wiring, power switching and circuit protection needed to create a clean, professional installation from scratch.

The Premium Harness combines 2.5 metres (8.2ft) of colour-coded and clearly labelled TXL automotive-grade wiring with a Haltech mini fuse and relay box.

The included fuse and relay box handles ECU, injection and ignition power switching and protection, plus fuel pump control, reducing the amount of additional electrical hardware that needs to be designed and sourced separately.

Haltech Nexus T1 T2 Harness – Premium Harness – More Than Just an ECU Loom

The key difference between the Basic and Premium Nexus T1/T2 Universal Harnesses is the integrated power distribution hardware.

The Basic Harness provides the unterminated ECU wiring required to build a custom loom.

The Premium Harness adds the Haltech mini fuse and relay box, providing a more complete starting point for a new vehicle or engine wiring installation.

The fuse and relay box provides:

• ECU power switching and protection
• Fuel injector power switching and protection
• Ignition system power switching and protection
• Fuel pump control

For a complete engine conversion or vehicle being rewired from scratch, this can significantly simplify the electrical installation.

Haltech Nexus T1 T2 Harness – Designed for Custom ECU Installations

The Premium Universal Harness is ideal where a dedicated plug-and-play harness isn’t available or where the vehicle is modified enough that a purpose-built wiring loom makes more sense.

Typical applications include:

• Engine conversions
• Custom street cars
• Race and competition vehicles
• Restomods
• Heavily modified performance vehicles
• Complete vehicle rewires
• Engines without a dedicated Haltech plug-and-play harness
• Builds where ECU and engine power distribution are being installed from scratch

Haltech Nexus T1 T2 Harness – Colour Coded & Clearly Labelled

Every wire is colour coded and clearly labelled, allowing your installer to identify, route and terminate each circuit according to the requirements of the engine and vehicle.

The harness is supplied unterminated, giving the installer the freedom to position sensors, actuators and electrical components appropriately rather than adapting a harness designed around another vehicle.

Key Features

• Suits Haltech Nexus T1 ECU
• Suits Haltech Nexus T2 ECU
• Designed for universal wire-in applications
• 2.5m (8.2ft) harness length
• Includes Haltech mini fuse and relay box
• ECU power switching and protection
• Injection power switching and protection
• Ignition power switching and protection
• Fuel pump control
• Colour-coded wiring
• Clearly labelled individual circuits
• Unterminated for custom installation
• Standard TXL automotive-grade wire
• Suitable for a wide range of engine applications

Basic vs Premium Nexus T1/T2 Harness

Basic Universal Harness

The Basic Harness provides the colour-coded, labelled and unterminated ECU wiring required to custom-wire a Nexus T1 or T2.

It’s a good choice when the vehicle already has suitable power distribution, relays and circuit protection in place, or where the installer wants to design those systems independently.

Premium Universal Harness

The Premium Harness includes the Haltech mini fuse and relay box, adding ECU, injection and ignition power switching and protection along with fuel pump control.

For a new engine conversion or complete custom installation, the Premium Harness provides a much more complete starting point.

Haltech Nexus T1 T2 Harness – Suits Nexus T1 & Nexus T2

The harness is designed for both of Haltech’s compact Nexus standalone ECUs:

Nexus T1 – supports applications with up to 4 cylinders or 2 rotors.

Nexus T2 – supports applications with up to 6 cylinders or 3 rotors.

Combined with the Premium Universal Harness, either ECU can form the foundation of a clean custom engine management installation without relying on an existing factory engine harness.

Haltech Nexus T1 T2 Harness – What’s Included?

• Haltech Nexus T1/T2 Premium Universal Wire-In Harness
• 2.5m (8.2ft) colour-coded and labelled TXL wiring
• Haltech mini fuse and relay box

Need Help Choosing Your Haltech Wiring Solution?

Lowe Fabrications is a Haltech dealer and installer.

If you’re deciding between the Basic or Premium Universal Harness, or aren’t sure whether a plug-and-play harness is available for your engine, contact us before ordering.

For most complete engine conversions and fresh custom wiring installations, we’d generally recommend starting with the Premium Harness, while the Basic Harness makes sense where suitable power distribution and circuit protection are already in place.