Cooking fuses

Cigar lighter is cut off, folded back and taped up, so thats most likely OK,. I suppose dome light could have issue or a wire leading to it.
Another thing I wondered about is that when I installed the emergency flasher switch connector I noticed there are two ways it can go on. Just four prongs in a square. I am wondering if its backwards or how you can even tell the right way it goes on.
Neal