Ls3 Wiring Harness Schematic. You may have to register before you can post. Here we learn how to modify the original equipment L99 or LS3 E38 ecm engine harness to work with a T56 six-speed transmission ending in a three wire hook up.
Retrofitting the stock harness requires knowledge of electrical circuits soldering skills and attention to detail. Before you go anywhere you must thoroughly read and understand the literature that came from General Motors about your LS3 engine and the wiring harness. LS3 tuning can be provided as well.
Brand new Standalone LS2 LS3 swap drive by cable wiring harness.
This is a true PLUG and PLAY harness. No cores or modifications needed. LS2LS3VORTEC 24X W 4L60E4L80E AUTOMATIC HARNESS WITH EV1 INJECTORS INSTRUCTIONS DRIVE BY CABLE HAR-1054 2005 - 2007 LS2 60L 24X DRIVE BY CABLE INSTRUCTIONS. HERE IT IS Our all new 58X Ls Engine Harness This particular build uses a DBW automatic 4l60e with a Tahoe gas pedal.