My battery went out on my truck, and it would not start, so I exchanged my old battery at wal mart for a new one, took it home, and proceeded to put it in. I am a girl, so I'm not too keen on auto repairs, but I figured installing a battery would be easy enough. I accidentally touched the positive battery wire to the negative post on the new battery, and the wire smoked a little. I went on to connect the wires to the correct posts, tightened the terminals, and now the truck won't start, it won't do anything. A few mechanics have said it was a fuse, but all of the fuses seem to be ok. Any suggestions?