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. 1969 c10 harness | eBay Find great deals on eBay for 1969 c10 harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. rear body tail light lamp wiring harness 69-72 Chevy GMC stepside pickup truck (Fits: 1969 C10 Pickup) Brand New. $96. Buy It Now. Free Shipping. SPONSORED.