Classic Update Kit - 1973-82 Chevy Truck We Make Wiring The 1973-82 Chevy / GMC Truck Kit is no exception. The kit boasts 12 features making it the most complete system of its type in the industry including: A replacement headlight switch with internal 25-amp circuit breaker, adjustable length shaft, and custom knob. Standard turn signal flasher, hazard flasher, and horn relay mounted on harness. chevy truck wiring harness | eBay Find great deals on eBay for chevy truck wiring harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Shop by category. Enter your search keyword 73-82 Chevy GMC Truck Pickup Wiring Harness Universal Wiring Kit 21 Circuit. Brand New. $99. Buy It Now. Free Shipping.