Low Beams dead, Hi Beam Fine?

Hey thanks for all the excellent troubleshooting ideas. This is a car that I picked up to try to interest my son in a father son project. He has now left and joined the US Marines so I am on my own trying to futz around with the Dart. I was hoping that it was not the bulkhead, because that thing is a gaggle of wires, all spray painted black (unknown why). I know a few of those terminals are melty looking , but that is a real old melt. A few years ago I did replace a couple of those Z terminal conectors, but tried to not mess with most of them. I wiggled them around and now the low beams work!!!! I have a bottle of DeOxit, I am thinking of spraying all the bulkhead bits. Might that help?? I do appreciate being taken to task by the elder members of this forum. Unfortunately I am a drummer by trade, which puts my IQ at a pretty low number.