Part# 74039 is a Quad H13 Soft Start Adapter Kit designed for use with 2020-2022 Ford trucks. This kit is essential for properly integrating Fisher and Western snow plows with the vehicle's lighting system. Its primary function is to add "soft start" modules to the headlights, which helps to prevent issues with the truck's computer system (specifically with the Quad H13 lights) that might otherwise occur due to the abrupt power draw of the plow lights. It allows the use of the 73973-1 headlight harness on these newer Ford trucks.