Vortec Wiring Harness: Car & Truck Parts | eBay VORTEC STANDALONE WIRING HARNESS (DBC) WITH LS3 INTAKE and 4L60E TRANSMISSION. Note that harnesses are fornon-emissions equipped vehicles and do not include air pump or EGR provisions. HIGH QUALITY, E.. STANDALONE WIRING HARNESS FOR 2007 & NEWER GM V8 VORTEC ENGINE W/ 6L80E OR 6L90E. VORTEC/TRUCK (24X) GEN III - Standalone Wiring Harness These harnesses include the Gen II LT1/LT4, Gen III (24x) LS1/LS6 and Vortec Truck Engines as well as Gen IV (58x) LS2, LS3, LS7, & Vortec and GEN V LT / ECOTEC3 Engines. All PSI Harnesses are Made in the USA.