Wiring Harnesses for Classic Chevy trucks and GMC trucks Wiring harnesses, wiring harness clips, and obsolete parts for classic Chevy trucks and GMC trucks from Classic Parts of America. 74 chevy c10 wiring | eBay Find great deals on eBay for 74 chevy c10 wiring. Shop with confidence. Skip to main content. eBay Logo: 1973-83 Chevy C10 American Autowire Wiring Harness Kit Classic Update 510347 (Fits: 1974 Chevrolet C10 Pickup) Brand New. $710. 69-74 Black Snap On Alternator Wiring Protector Ground Cover Cap SS W30 GS Judge See more like this.