4.3 vortec harness | eBay Find great deals on eBay for 4.3 vortec harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Shop by category. Enter your search keyword 2000 S10 TRUCK 4.3 VORTEC V6 COMPUTER ENGINE MOTOR WIRE HARNESS TRANSMISSION ECM. Pre-Owned. $99. or Best Offer. Free Shipping. Direct-Fit Custom GM LSx/Vortec/LTx Engine Wiring Harness Our Direct-Fit custom wiring harnesses are plug-and-play, custom built, and designed specifically for your project utilizing a 94-97 LT1/4 or 97-up LSx or Vortec small block. Each harness is built from scratch specifically for your engine and vehicle combination.