I was replacing the drive/tow switch, "I did not unplug the power" there was some arcing amongst the drive /to rocker switch then I lost power to the dash board, and nothing happens when I turn the key on, the main fuse is good, Fu3 fuse is good, fu2 fuse has a broken leg, Fu5 fuse is bad, before I replace them I would like to know what the do, and would also appreciate any help