TCA – 1.5m/3ft Flying Lead Harness Only. Flying Lead Harness Length: 1.5m (3′)

Professional TCA Integration: 1.5m Flying Lead Harness Only

In high-fidelity standalone ECU integration, the method by which data is routed to the ECU is as critical as the data itself. The TCA – 1.5m/3ft Flying Lead Harness is a professional-grade wiring interface designed specifically for the Haltech Thermocouple Amplifier (TCA) range. This harness provides the essential electrical connection for utilizing the optional 0-5V analogue outputs on the TCA 2 or TCA 4 modules. By providing a clean, shielded path for these signals, the harness ensures that your EGT or fluid temperature data is transmitted without signal artifacts, which is foundational for maintaining accurate detonation protection maps.

Engineering Principles: Analogue Signal Fidelity

Thermocouple signals are millivolt-level and highly susceptible to EMI (Electromagnetic Interference) from ignition coils and alternators. The TCA module amplifies these signals into a robust 0-5V range. This Analogue-to-Digital interface (the TCA output) requires high-quality wiring to maintain calibration accuracy over the 1.5-meter run. This flying lead harness is constructed using automotive-grade materials designed for high-vibration and high-heat environments common in LS-swap or 2JZ engine bays. The 1.5m length provides the necessary slack for professional harness integration, allowing for the TCA module to be mounted away from extreme heat sources while still reaching the ECU’s input channels.

Operational Benefits for Custom Telemetry

While most modern Haltech systems use CAN bus for TCA data, this flying lead harness is only required if using the optional 0-5V analogue outputs. This is critical for users running older ECUs that lack CAN expansion, or for those who wish to route temperature data directly into a standalone data logger or aftermarket gauge. In a fuel map calibration scenario, having accurate EGT data on an analog channel allows for high-speed logging and instant fueling corrections. This harness ensures that the signal remains deterministic, providing the timing reference needed to safely push the engine to its limits on variable octane or race fuels.

Installation and Professional Interface

This harness is a universal component for TCA module integration and features color-coded leads for easy identification. During harness integration, each lead should be terminated with professional crimp connectors and protected by heat-shrink tubing. The 1.5-meter length allows for versatile routing across the firewall or along the main chassis harness. It is essential to ground the signal reference wire correctly at the ECU to prevent ground offsets that could skew the temperature readings. This harness represents the professional standard for builders who require high-resolution analog feedback from their thermocouple system.

Technical Specifications Table

Summary & Includes

The TCA Flying Lead Harness is the specialized interface for analog temperature data extraction. Includes: 1 x 1.5m Flying Lead Harness. Note: This harness is only needed when utilizing the TCA module’s 0-5V analog outputs rather than the CAN bus interface.