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How many chassis wires does a stripped GM harness need for an E36 LS swap?

Here is what the documentation says. Each point links to its source; details depend on your exact computer, harness and transmission.

  • E38 ECM; Chevrolet Performance NA LS control kit 19171935; LS2/LS3/LS376/LS7/LSX454; 58x/4x; 2006+: 12-way bulkhead connector output pinout (white/tan/brown wires). (Chevrolet Performance)
  • E38 ECM; Chevrolet Performance NA LS control kit 19171935; LS2/LS3/LS376/LS7/LSX454; 58x/4x; 2006+: MIL output is an ECM-controlled ground circuit. (Chevrolet Performance)
  • E67 ECM; Chevrolet Performance LSA E-Rod control system 19299067; LSA: LSA MIL is mounted inside the fuse/relay center with a redundant in-cab output. (Chevrolet Performance)
  • Sources differ: Chevrolet Performance NA LS kit (19171935) where bulkhead B = brown/white MIL
  • E67 ECM; Chevrolet Performance LSA E-Rod control system 19299067; LSA: LSA bulkhead pin B is empty/plugged. (Chevrolet Performance)
  • Sources differ: Chevrolet Performance NA LS kit (19171935) where bulkhead B = brown/white MIL
  • 0411 PCM (GM service #9354896 or 12200411); 1999-2007 Vortec DBC (LM4/LM7/LQ4/LQ9/L33/L59); T56 or non-electronic automatic: MIL should illuminate at key-on and go out after a clean start. (PSI Conversion)
  • 0411 PCM (GM service #9354896 or 12200411); 1999-2007 Vortec DBC (LM4/LM7/LQ4/LQ9/L33/L59); T56 or non-electronic automatic: HAR-1019 deletes EGR, AIR, CCP and rear O2 wiring. (PSI Conversion)
  • E38 ECM; Aeroflow AF49-1506; 58x LS3/LSX; DBW; T56 or non-electronic automatic; 2006+: AF49-1506 deletes rear O2s and emissions-device wiring. (Aeroflow Performance)
  • Gen III PCM; Aeroflow AF49-1505; LS1/LS6; DBC; 4L60E/4L80E: AF49-1505 deletes rear O2s; front LS1 O2 is GM 25161131. (Aeroflow Performance)
  • Gen III DBW: blue/green P59 PCM; Gen III DBC: red/blue 0411 PCM; 1999-2007 Vortec; 4L60E/4L80E: BP Automotive hookup wires: fuel pump, ignition, TCC brake, MIL, speedo, tach, fans, cruise. (BP Automotive)

Confirm against the instructions for your exact parts before wiring. More: Harness and power in our tuning guide.

Confidence: medium — sources disagree or are limited; check the sources below.

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Sources
  1. LS Series Engine Control System Guide — Chevrolet Performance (via Scribd)
  2. https://es.slideshare.net/slideshow/har-1019-vortec-swap-wiring-harness-instructions-efi-conversion-fro/47382494 — PSI Conversion
  3. https://www.crateenginedepot.com/pdfs/lsa_e_rod.pdf — Chevrolet Performance
  4. https://aeroflowperformance.com/pub/media/Instructions_PDF/AF49-1506.pdf — Aeroflow Performance
  5. https://aeroflowperformance.com/pub/media/Instructions_PDF/AF49-1505.pdf — Aeroflow Performance
  6. https://bp-automotive.com/product/gen-iii-drive-by-wire-vortec-4l60e-standalone-ls-swap-harness-w-ev1-injectors/ — BP Automotive
  7. https://www.lsxmag.com/tech-stories/plug-in-play-installing-a-standalone-harness-for-an-ls-swap/ — LSX Magazine
  8. https://www.lsxmag.com/tech-stories/diy-or-buy-a-look-at-the-ls-standalone-harness-dilemma/ — LSX Magazine