Headlights won’t turn offApril 4, 2011April 5, 2011I have a 2004 ford F-150 5.4 L lariat and the lights won’t turn off unless I unhook the battery or take out the fuses. Share Tweet Pinterest Keywords:ElectricalHeadlightsrelay 1 thought on “Headlights won’t turn off” Kristen April 5, 2011 at 8:54 pm Sounds like you have a headlight relat sticking to me… Would be the first place I would check. It is located in the underhood fuse block. For the exact location refer to your owners manual. Comments are closed.