Haltech Ignition Harness - GM GEN III LS1 & LS6 Terminated Ignition Harness

Overview

This factory-terminated ignition harness delivers plug-and-play integration between your Haltech ECU and GM Gen III LS1/LS6 coil packs, eliminating the need for custom wiring and potential ignition timing issues. Purpose-built for LS swaps and EFI conversions where reliability and precise timing control are non-negotiable.

Technical Specifications

• Part Number: HT-045657
• Application: GM Gen III LS1 & LS6 engines
• Connector Type: Factory-terminated coil pack connectors
• Wire Gauge: OEM specification for ignition loads
• Length: Optimised for standard LS engine bay layouts

Why You Need This

LS swaps are only as good as their ignition system, and bodged wiring is the fastest way to turn a bulletproof LS into a roadside breakdown. This harness solves the critical connection between your Haltech ECU's ignition outputs and the LS1/LS6's individual coil packs, using the correct wire gauge and factory-spec connectors that won't corrode or create voltage drops. We've seen too many LS builds where custom-spliced ignition wiring creates misfires, especially under boost where clean spark delivery becomes absolutely critical.

The LS1 and LS6 use a specific coil pack arrangement that differs from later LS variants, and this harness maintains those factory connector pinouts while providing the clean interface your Haltech needs. Whether you're dropping an LS1 into a drift car, building a turbo LS6 track weapon, or converting a classic to modern EFI, this harness eliminates the guesswork and potential failures that come with DIY ignition wiring. The result is consistent spark timing, cleaner combustion, and the reliability to actually finish your track sessions or road trips.

ECU & System Compatibility

Compatible with the full Haltech Elite and Nexus range including Elite 550/750/1000/1500/2000/2500 and Nexus R3/R5 systems. The harness connects to your ECU's ignition outputs and requires configuration through NSP software for your specific LS1 or LS6 firing order and timing requirements. Contact our team to confirm compatibility with your specific ECU model and ignition setup.

What's in the Box

• Haltech terminated ignition harness with factory LS1/LS6 coil pack connectors
• ECU-side termination for direct connection to Haltech ignition outputs
• Installation documentation and wiring reference

Complete Your Build

Most customers completing an LS1 or LS6 conversion also need our Haltech engine harness options and ECU mounting solutions to complete their EFI swap. We stock the full range of LS-specific Haltech components here in the UK, and our pre-sales team can specify exactly what you need for your particular chassis and power goals. Contact us for a complete LS conversion package quote with everything from ECU to sensors.