Elite 2500 & 2500 T Premium Universal Wire-in Harness Length: 2.5m (8′)

Professional Grade Power and Logic Distribution

The Elite 2500 & 2500 T Premium Universal Wire-in Harness (2.5m Length) represents the industry standard for wiring standalone engine management systems into vehicles that lack a plug-and-play solution. Designed for the Haltech Elite 2500 series, this “Premium” variant distinguishes itself by integrating a comprehensive power distribution module directly into the loom. This design choice is critical for reliability; it ensures that the ECU, injectors, and ignition coils are supplied with clean, fused power through dedicated relays, completely independent of the vehicle’s aging or inadequate factory wiring. With a standard length of 2.5 meters (8 feet), this harness is perfectly sized for most standard front-engine, rear-wheel-drive, or front-wheel-drive layouts where the ECU is mounted in the passenger footwell or under the dashboard.

Engineering Durability and Signal Integrity

Wiring is often the overlooked hero of a high-performance build. This harness utilizes superior materials to guarantee performance under load. The wires are jacketed in high-temperature insulation capable of withstanding the harsh thermal cycles of an engine bay. Crucially, the signal wires for sensitive inputs—such as the Crank Angle Sensor (CAS) and Knock Sensors—utilize twisted-pair construction and shielding. This physics-based approach cancels out electromagnetic interference (EMI) from high-voltage ignition components, preventing “noise” from corrupting the data the ECU uses to calculate timing and fuel. Without this level of signal protection, high-horsepower engines are susceptible to misfires and timing drift.

The integrated fuse box is molded specifically for this application, housing four relays and seven fuses. This creates a compact, water-resistant power hub that simplifies the installation process. Instead of sourcing separate fuse blocks and wiring relays manually—a process prone to errors—the installer simply connects the main battery power and ground, and the harness handles the distribution logic for the entire engine control system.

Installation Strategy

This harness provides the “blank canvas” needed for custom builds. One end is professionally terminated with the AMP Superseal connectors that plug directly into the Elite 2500 ECU. The other end features unterminated, color-coded, and printed wires. The installer routes these wires to the various sensors and actuators on the engine, cuts them to length, and terminates them with the appropriate connectors (e.g., Deutsch, Bosch EV1, Metri-Pack). This results in a mil-spec quality installation with no excess wire bundled up under the dash, providing a clean, factory-finish look tailored exactly to the vehicle’s dimensions.

Fitment Guide

This is a Universal product. It is compatible with any engine engine configuration supported by the Elite 2500 ECU.

• Standard Length: 2.5 Meters (8 feet) – Ideal for typical coupe, sedan, and hatch applications.
• Application: Custom engine swaps, race cars, restomods, and vehicles with damaged factory wiring.
• Compatible ECU: Haltech Elite 2500 / 2500 T.

Technical Specifications

Summary & What’s Included

The Premium Wire-in Harness is the safest and most professional starting point for a custom EFI installation. It ensures your Elite 2500 has the robust power foundation it requires to perform complex calculations and drive high-current actuators.

Includes:

• Universal Wire-in Harness (2.5m)
• Firewall Grommet
• Moulded 6-Circuit Haltech Fuse Box & Lid
• 4 x Relays
• 7 x Fuses
• Spare pins for auxiliary power circuits