Gen II · Gen III · Gen IV
Pro Wire Harness
Handcrafted in the USA: LS1, LS3, and LSX harness systems using new TXL and GXL synthetic low-resistance color-coded wire, crimped and soldered to every terminal. Navigate to your desired powerplant below.
Every Pro Wire Harness is built in the USA with new TXL and GXL color-coded wire. Terminals are mechanically crimped with the correct GM tooling, then soldered. Circuits are labeled and branched for your layout so you can drop it in and diagnose it later.
What's different about a Pro Wire build
- Custom routing and branch lengths for your engine bay
- Clearly labeled circuits built for serviceability
- Genuine GM / Delphi connectors and terminals
- ECM programming available with the harness
- Built for your powerplant — not a generic "close enough" pinout
SSW LS1 G10 Wiring System — labeled connector layout
Why builders choose SSW
Cheap knock-offs and assembly-line harnesses force you to adapt the car to the wiring. We reverse that: you tell us the combo, we build the harness and calibration around it. We've stood behind that approach since 1999.
Ready to start your build?
Text or call 210-370-7791 to talk through the project, or start a build request with engine, transmission, and vehicle details.