Alright, I have a 2004 Duramax, since Monday here in Wisconsin it has been extremely cold, so I've been plugging my truck in at night. Unfortunately it has had a hard time starting and than today my battery light came on so I tested my alternator and found that I was not getting anything from my alternator. So I went and got a new one and put it in tonight. But I still have the same no charge issue, I am stumped at what it could possibly be, any sugguestions would be great!