Every diagram on the bench,ready to print.

Engine harness pinout for a common LS swap application — wire colors, sensor locations, and the PCM connector reference that stays clipped above the bench.

Tank-to-rail fuel-system flow with returnless regulator logic, pump placement, and the supply-pressure thresholds that catch a weak in-tank pump before cranking.

Full PCM and engine harness pinout for the LS electrical track with wire colors, circuit numbers, and the underhood cavity reference that stays clipped above the bench.

Body integration wiring diagram showing GM LAN bus backbone, terminating resistors, module addresses, and the differential voltage pattern that diagnoses a single-module drop.

Donor-to-chassis body integration diagram with fuse/relay panel mappings, ignition switch wiring, and the fuel-pump relay circuit that catches the wiring mistake that bricks a fuel pump.

Lift pump, secondary filter, and common-rail accumulator flow for a 6.7 Power Stroke — with the supply-side vacuum thresholds that isolate a failing transfer pump.

Full engine harness pinout for a 6.7 Power Stroke — wire colors, circuit numbers, and the GPCM connector reference for cold-start fault tracing.

Per-cylinder compression and leak-down pass/fail thresholds for Duramax, Power Stroke, and Cummins platforms — the reference that decides between a top-end and a full rebuild.

Symptom-to-splice fault isolation sequence — start with a no-power complaint and work step-by-step through fuse, relay, ground, and continuity checks to the root cause.

Visual ID guide for common automotive relay types, blade and Weather-Pack connector families, and the terminal retention release tools that get them apart cleanly.