Fuse 4 blows

Ok guys, FNG here. I bought a 73 dart swinger two weeks ago. Runs and looks great but I have some electrical issues. I didn't have any brake lights so checked my fuses and fuse 4 was blown. When I installed it the dome light came on and was on continuously with the doors closed. I should mention, when it pulled the blown fuse it was a 30A. I tried the turn signals since the left wouldn't work before the swap and both worked but they dont flash. I hit the hazards and everything flashed including the dome light. Then the fuse blew. :wack: the funny thing is I am getting mixed indications. I didn't have dash lights before the fuse and now they work after. I didn't have left signal before and now I do except for the one on the front fender. I don't know what info I need to give you guys to help you help me. I used to troubleshoot aircraft so I'm competent. I tried a bunch of things and wrote down all the things that worked and didn't work so ask away.