do it 1/0 guage. i don't see the point in 4 guage. in the future if you ever get a bigger alt or bigger amps you don't have to redo it. 1/0 guage is much more expensive. go to http://www.weldingsupply.com
were doing a big 3 tutorial along w/ a battery/wire/blah comparison today...we'll post the results //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif