I've been trying to track down info on this. Also, as with my 2006 lights without the auto feature, they probably come on in the day, but you can't see them. At least mine do.
I haven't found the exact location of the dusk sensor to see if it is there or not, most people seem to incorrectly identify the compass on the rearview as the sensor. It may be there, but I haven't seen definitive proof. In my 08 Edge, it was on dash in the security indicator with the blinking light.
I would love if someone could definitively point it out, and if anyone has the info of what's needed to add for this feature (if the sensor exists, is it just a switch replacement, if it doesn't exist on non-automatic headlight equipped models, what basic parts are needed to accomplish this)
It's the one feature I definitely miss from my Edge -- I haven't manually turned headlights on and off in my last 3 vehicles and I guess I've gotten lazy.
If anyone wants to chime in, I'm sure it will help both of us.. I imagine with the extra wiring that seems to be in these trucks, it wouldn't be a huge hassle to get the factory pieces and get it done. I saw from searching that a few people were looking into attempting it, perhaps they accomplished it and could help, or found it too involved and abandoned their search?