(Cab Electrical) Anyone Know What This Is?

[Boydness]

Having problems getting the electrical sorted out. The Headlights and tailights now refuse to work. I have a custom bed on the back with just 4 trailer style circle red lights (2 on each side).

I have a single black line hanging unconnected from the "C" shaped wiring loom, and a Dark Green and a Red cable from the fuse block(out the side) unconnected. I believe that all 3 connect to the same component.

I used the wiring diagram to figure out what the mystery cables from the fuse block were suppose to be connected to(I think), but have no idea what it is?

I highlighted the area surrounding the component in yellow.

Any ideas?


Boyd