Dual Speed Electric Fan Control Wiring Harness Kit 674-00923 FOR Chevy Silverado Feature: High Quality: Crafted with high-quality materials and built to meet or exceed OEM standards, this wiring harness kit guarantees durability and long-lasting performance. Function: The 67400923 dual speed electric fan control wiring harness an independent fan harness, Only for 34-inch wide radiators. Installation: The wiring harness includes relays and circuit breakers in the fuse box. All wires are produced with automotive spec wire, installation standard, professional installation is recommended Description: .