1998 Buick Century 40a crank fuse blowing

You guys will have to forgive me, I know a bit, but by no means am I a car guy. My problem is, I went to start my car and when I turn the ignition to start the car(I believe you guys call it pos3) the 40a crank fuse under the hood blows. After reading a few things I was thinking it is a short somewhere, so in the process of trying to diagnose the short, I opened the car door and the key dinger was very faint, and also after sitting for 2 days the battery is just about dead. The crank fuse is not in and the key was not in the ignition. Also when I went under the hood to look my ear was by the brake cylinder and I can hear a very faint clicking sound, and it is much faster than the ignition ding, so I don't think its that. The sound is only there when the battery is connected. And I am assuming that there is a parasitic draw somewhere since the battery died just sitting there. Any suggestions you guys may have would be much appreciated.