My 1973 Dodge Dart Sport Project

While gutting the trunk I ran into some odd loose connections. Also, while working tonight, for no reason at all, my dome light stopped working, and my gauge lights worked (my gauge lights haven't worked since I bought the car… I'm hoping some of you can tell me what some of those connections are. I also found that right next to my battery there was a box that had a wire going to the battery. I extended that wire, it was stretching to reach the battery lol. I would label which pictures are which, but I'm not sure how to put text between the pictures...