Wiring

Wiring is the most year-specific part of an LS Gen Coupe swap. Colors and pinouts change between BK1/BK2 and 2.0T/3.8 models. Always verify with a multimeter and your factory service manuals before cutting or splicing.

Shop manuals & wiring diagrams: Google Drive folder (all years)

Passenger-Side Fuse Box

If you want to keep factory A/C function, keep the passenger-side fuse box and the stock ECU (or at least the harness sections that feed A/C). Otherwise you can simplify and remove more of the factory engine harness.

Passenger side fuse box wires labeled: 12V, FP, A/C, CAN, Starter

Key wires pulled from the passenger-side area. Labels match the functions below.

Key wires commonly used from this box:

  • Large pink — Starter signal. Wire directly to the small stud on the starter.
  • FP (fuel pump) — OEM fuel-pump power (often red/white). Use as a trigger for a dedicated fuel-pump relay (or to the Holley green FP wire if you already have a relay). Also available near the driver's kick panel if you prefer to keep it out of the bay.

Community & Parts Links