To select the correct LS1 standalone wiring harness, you must first determine if your engine has a manual or automatic transmission and a “drive-by-cable” (DBC) or “drive-by-wire” (DBW) throttle body. Most standalone kits are compatible with all GM LS series engines from 1997–2006, including the LS1, LS6, and Vortec 4.8L, 5.3L, and 6.0L.
High-quality options
These harnesses from established brands generally use new, high-temperature-rated wiring and OEM-grade connectors for reliability.
Painless Performance Products EFI Harness
: This kit is for Gen III LS engines and is a highly reputable choice for engine swaps.
PSI (Performance Systems Integration) Standalone Wiring Harness
: A widely recognized name in the LS swap community, PSI conversion harnesses feature high-temperature TXL wire and ultrasonic welding for secure connections.
CBM Motorsports LS Standalone Wiring Harnesses
: CBM uses new OEM GM Delphi connectors and US-made TXL wire built to GM specifications.