2003 silverado wiring harness | eBay Find great deals on eBay for 2003 silverado wiring harness. Shop with confidence. Skip to main content. eBay Logo: Chevy Silverado Fog Light Wiring Harness 2003-2006 (2007 Classic) 1500 2500. Brand New. $44. or Best Offer. For 2003-2018 Chevrolet Silverado 1500 Trailer Wiring Harness Hopkins 18475FS See more like this. 2003 Chevy Silverado OE Wiring Harnesses & Stereo Adapters Chevy Silverado 2003, Factory Replacement Wiring Harness by Metra®, with OEM Radio Plug. For factory stereo. This high-quality Metra wiring harness is just what you need to replace your defective or aged factory wiring harness.