Complete Hardware Bundle - Comes with a 40A relay, wiring harness, inline fuse holder, 20A fuses, temperature switch, adapter, terminals, and connectors.We've included all components for a seamless setup Temperature Control - Activates at 185°F (85°C) and deactivates at 175°F (79°C), featuring a 3/8" NPT thread with 1/2" adapter for flexible installation. This ensures your engine stays within the optimal temperature range, preventing overheating and extending its lifespan Plug-and-Play Wiring - Includes a detailed diagram: red wire to 12V+ power, brown to the fan, white to , black to the sending unit. 14AWG wires handle 40A; Universal Compatibility - This kit fits 10/12/14/16-inch cooling fans, ensuring broad applicability for various radiator sizes and vehicle types. Wide Application - Ideal for cars, trucks, SUVs, RVs, and industrial equipment, providing reliable cooling system protection. From daily commuters to workhorse vehicles, this kit offers versatile performance across different automotive and industrial scenarios