Honda T1 Coil-On-Plug Harness LINK GX4 / PNP

This Honda T1 Coil-On-Plug harness is a complete, full-length ignition wiring solution designed for builders running a T1 ignition module or retaining T1 functionality on OBD1 Honda ECUs. Built using proven motorsport wiring practices, this harness provides a clean, reliable, and affordable path to coil-on-plug ignition without compromising on materials or execution.

Sourced from CarrotTopTuning and offered through VTEC Innovations, this harness fills the gap between low-quality DIY COP setups and full custom mil-spec systems — making it ideal for street, track, and budget-conscious performance builds.

True Full-Length COP Harness – ECU to Coils

Unlike short breakout or adapter-style solutions, this is a true full-length coil-on-plug harness, running directly from the ECU to the ignition coils and T1 module. This eliminates unnecessary splices, extensions, and failure points while ensuring clean routing and proper signal integrity.

The harness is designed to support reliable ignition performance while keeping installation straightforward and serviceable.

Motorsport-Grade Materials at an Affordable Tier

This harness is constructed using Tefzel (ETFE) wire throughout, providing excellent heat resistance, chemical resistance, and long-term durability compared to standard automotive wiring.

Expandable loom is used to protect the harness while allowing flexibility for clean routing in the engine bay. A booted DTM 4-pin connector is used at the T1 module for a sealed, professional connection.

Power for the ignition system is protected by an integrated fused power lead located near the ECU, simplifying installation and improving safety.

OBD1 ECU Terminated – Ready to Install

All ignition outputs are properly terminated with OBD1 ECU pins for:

• Coils 1–4

• T1 ignition outputs

This allows for a clean, plug-in installation on compatible OBD1 ECUs without additional wiring work. Designed for customers who want a functional, reliable COP solution without stepping into a fully custom harness.

Ideal for Budget Builds & T1 Retention

This harness is perfect for:

• Budget-focused coil-on-plug conversions

• Builds retaining a T1 ignition module

• Street and track cars needing reliable ignition wiring

• Customers not ready for a full custom mil-spec COP harness

It delivers dependable performance while keeping cost and complexity under control.

Compatibility

Designed for Honda OBD1 ECU applications using a T1 ignition module and compatible coil-on-plug setups. Proper ECU configuration and tuning are required for correct operation.

Important Notes

This product is intended for performance applications.

Proper ECU configuration and ignition tuning are required.

This harness is offered as a budget-tier solution and is not a replacement for a fully custom mil-spec COP system when advanced routing, shielding, or integration is required.