Help with no headlights. 1974 scamp. Blinkers come on instead...

Pic 3 is a bad pic, but thats the only wire i can find that is disconnexted.
I think the blue box is the old seatbelt interlock. I assume i can just unplug it.
That wide dual plug...idk what it is.
Black wire is bared, but made no difference when grounded.

Do the headlights run through the bulkhead plugs? I have some ugly wires on the passenger side plug...but if im reading the "mymopar" diagram right, those arent for the lights.