Overview Essential replacement plugs and pins for LS1 coil connections when building custom harnesses or repairing damaged wiring. These genuine Haltech connectors ensure reliable spark delivery in high-performance LS builds where factory plugs have been cut or damaged during engine swaps. Technical Specifications Part Number: HT-020103 Application: LS1 ignition coil connections Contents: Connector plugs and terminal pins Quality: OEM-specification terminals Why You Need This LS engine swaps often require custom harness work, especially when adapting factory coil connections to aftermarket ECU systems or when original plugs have been damaged during removal. Poor connections at the coil are a common cause of misfires and inconsistent spark delivery — particularly problematic on boosted applications where reliable ignition becomes critical. These replacement plugs are essential for builders creating clean, professional harnesses in LS1-powered kit cars, drift builds, or engine conversions where the factory loom has been modified. Rather than bodging connections with generic terminals, proper LS1 coil plugs maintain the sealed connection that prevents moisture ingress and ensures consistent contact resistance across all cylinders. ECU & System Compatibility Designed for LS1 coil connections in custom harness applications. Works with any ECU system driving LS1 coils, including the full Haltech Elite and Nexus range when configured for direct coil control. Perfect for standalone ECU conversions where factory harness sections need rebuilding. What's in the Box LS1 coil connector plugs Matching terminal pins Installation hardware Complete Your Build Most customers building custom LS harnesses also require additional wiring components and connectors. Our technical team can advise on the complete connector kit needed for your specific application — whether you're building a complete standalone harness or simply repairing damaged sections. With our UK stock and expertise in LS conversions, we'll ensure you have everything needed for a professional installation first time.
