How To: LS Swap Engine Harness Modification Part 1

This LS swap guide is from the perspective of a 2003 5.3 and 4l60e out of a Tahoe with the stock wiring harness and computer, but not using any of the stock fuse boxes or relays. The procedure should be similar for all LS swaps. You are going to need 4 relays (up to 7 […]