u/No_Entertainer_4449

Looking to hook up a U-Haul trailer for a road trip. Anybody have experience putting in a wiring harness. Watched the video on U-Haul and seems pretty easy hooking up the adapters to the tail lights but I was surprised to see that a lead needed to go to the battery. Figured the power just came through the existing tail lights. Does anyone have a link to one they had used and can confirm it needs the battery power or just the tail lights are fine. I saw one available on e-trailer. Ty

Running the initial deal again at some point. Maybe around black Friday or Christmas?Am I just way off on this?