holy wire shortage...

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I was charging my battey today turned around for a miniute when I got back out to the truck smoke was billowing out from the hood and seaping into the cab, i was literally gone for one miniute. There is a wire from the battery to a little box on the inside of the fender and from there to a harness with 4 or 5 other wires, and it ran to inside the cab. The wire was a thicker red wire. Under the dash is a mess of wires and i couldnt loacte where it went. Anyone have any ideas or suggestions???