Saw an ad for a used warn winch in a paper and wanting one but have a question about what needs to be done before i get one. Like does battery size and alt. out make a difference. The battery i have is just a cheap battery and alt. is a stock replacement. Do I need to up grade first before the winch or will they hold up for awhile? What size battery should I have to use a 8000-9000 lb winch? What should the amp on a new alt. output be rated at? Never had a winch before what do i need to know?