2010 chevy cobalt wiring harness | eBay Find great deals on eBay for 2010 chevy cobalt wiring harness. Shop with confidence. 2010 Chevy Cobalt OE Wiring Harnesses & Stereo Adapters Chevy Cobalt 2010, 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.