Derale 16763 Electric Fan Relay Wire Harness - Black - Universal Cooling System Upgrade for Cars, Trucks & SUVs - Perfect for Engine Overheating Prevention & Performance Tuning

Added external dual fan for transmission cooler due to towing need and towing package on truck did not include extra transmission cooling. This relay switches battery voltage when needed to kick on added electric fans when called upon from the Derale in line thermostat request. Appears to be quality product and works as advertised.