So I had some ac work done on my truck like a month or two ago and some genius didn't tighten one of my battery cables enough. Something still doesn't add up here though. The truck in my sig has two 850cc amp batteries and I would think it would still start off of one battery. All it did was click when I turned the key and I had to be jump started. Anyways, I got to thinking that since the batteries are wired up in parallel that you should unhook them and test them individually, which they didn't do. Opinions? I'm glad my 1/0 gauge jumper cables finally came in handy.