Engine Wiring Harness – Quadstar Tuning LLC Save $4 Fits 1994-2002 6 N/A and Turbo Diesel engines with the side-mount turbo and the electronic DS4 injection pump. This is made to upgrade and replace the OEM harness that goes between the rear of the engine and the sensors/injection pump. This new wire harness will only mount ABOVE the intake manifold. 6.5 diesel wiring harness | eBay Find great deals on eBay for 6.5 diesel wiring harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Shop by category. Enter your search keyword CHEVROLET GMC 6.5L TURBO DIESEL GLOW PLUG WIRING HARNESS KIT BLUE IMPROVED! Brand New. $134. Buy It Now. Free Shipping.