Wiring Harness Manufacturer's Association The Wiring Harness Manufacturer’s Association is the ONLY trade association exclusively representing the cable and wiring harness manufacturing industry. “Being a member of WHMA gives us a great opportunity to network with suppliers.Member Rosters · Supplier Profiles · Ipc/Whma-A-620 · Annual Conference · Board of Directors · OEM Wire Harnesses - Complete Wiring Kits - Standard Harnesses Complete Wiring Kits; Standard Harnesses; Standard Harnesses. Sort By: 8 Circuit Wire Harness. $285. Product Description Overview Our 8 Circuit Second Generation Wire Harness is designed as a cut-to-fit universal complete restoration wire harness. These kits will support your entire electrical system from headlights to tail lights.