This is a plug and play harness designed to add fog lights to your 2019- 2022 heavy duty, Dodge Ram truck, 2500-3500. Built with all top quality materials. This harness will last the life of your truck. It is by far the easiest install. With this harness, your fog lights will illuminate whenever your headlights are turned on, or if you turn your headlights to the park light mode on the switch. With this harness, your fog lights will stay illuminated with your low beams and with your highbeams , be sure and check with the laws in your state to see if the function described is legal in your area before buying.