I have a 2010 Explorer XLT that came without the auto headlight option. I believe it has the sun sensor installed, as I can see the black round item sticking out of the middle of the dash by the windshield (the same thing that flashes the red light for the alarm). From some research I thought if I simply changed the headlight switch to one that has the auto light option, the automatic headlights would work. Apparently I was incorrect. The truck's light switch came with manual lights with fog lights feature; I changed that out to a Motorcraft switch with the auto light feature. It installed perfectly, no modifications needed. What am I missing to get this working? Thanks.