2018 cargo light. FIrst. The cargo light with led is bright. I will put inline a LED 12Vwired LED controller with a remote control. Second, The circuit may go under the dash. What I found is a connector Above the Right side passenger head. If you remove the Right side Black Foam part, behind it is the connector. The wire follows in the door track to the Righ side dome light in the 18 XLT. If you are under the front headliner soundproofing you would need to disconnect that right side overhead plug. # I plan to break into that circuit and place a ON/OFF switch into the overhead plastic bin wall facing out. I may place a 12V USB port in the same area overhead.