on some alpine you have to go into a menu and turn the aux function on. the port your are using for aux is actually for a cd changer. i believe its under function or setup menu.
Thanks for the tip! I'll have to look into it. I just pressed the source button and nothing else came up besides radio and CD. I read up on this adapter on the Alpine site and thought it might work. http://www.alpine-usa.com/product/view/kca-121b/
On a related note, I started my week off with a dead battery. Wonderful Monday morning. I don't think anything was drawing amperage from it. I have the headboard and visors out so it shouldn't be anything up there. Bulb is out of the hood compartment light as well. Dunno when the battery was replaced before but it's an decent Interstate one. It's been through a dead alternator and two summers here in the desert so it might just be on the way out. Checking if it will hold a charge now.