I have a 2003 Buick Century that was running just fine before it sat for about 3 weeks. And during that time, temps fell below zero for a few days. The battery is a brand new interstate battery, and I checked to make sure it was charged, and it was. We don't even get a clicking sound. It's just sort of a thud sound from the fuse/relay box under the hood. Bad fuse or relay? Starter? I'm trying to figure out what to start with first.

Jeff