LS Harness Info

3rd Gen LS Harness Info

Bellow is all the information that I have collected and devoloped for 3rd gen LS harnesses from 99 to 07 Chevy/GMC trucks and SUVs.

3rd Gen Pinout Tables

These are the pinout tables for therd Gen LS ECMs. Both 99-02 and 03-07 in one print out. The year range will be at the top of each table.

View PDF Walkthrough Video (coming soon)

Fuse Block Diagram

This fuse block is set up to have battery power and ignition power on separate blocks. This fuse block uses 7 fuses and 2 relys.

View PDF Walkthrough Video (coming soon)

3rd Gen Fan Control Harness

This fan harness is designed to work independently from the engine harness and with the ECM control wires. This allows the end user to have a manualoverride for fan control.

View PDF Walkthrough Video

4th Gen LS Harness Info Coming Soon

The 4th gen LS engine ( 07.5-13 ) has a completly different ECM and harness setup compared to 3rd gen ( 99-07 ). The information will be avilible in the same format as soon as it is ready.