Headlight / engine wiring issues

Okay, I don't know much yet, I bought the car to kind of learn the ropes as I go and electrical is very intimidating for me so any help is greatly appreciated.

I've had no lights in the front of the car since day one, I've done basic testing with a multimeter, dielectric greased many connections, but the wiring is quite ****. I think the previous owner fooled around with it too much.

Do I buy a new harness for the front? I'm not sure where to go from here.