ford focus wiring harness 2003 | eBay Find great deals on eBay for ford focus wiring harness 2003. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Shop by category. Enter your search keyword Metra 70-5520 In-Dash Radio Wiring Harness for 2003-2006 Ford/Lincoln/Mercury . Brand New. 5.0 out of 5 stars. 2003 Ford Focus OE Wiring Harnesses & Stereo Adapters Ford Focus 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.