need help diagnosing a no-start, electrical problem Options

[6strngs]

So, the other day I went out to start my car, and it was cranking, but not starting. I turned it off, then tried again and nothing happened at all, no clicks, nothing. So I took my dad's car to work, but then when I got home, I tried again and noticed that when you turn the key just to the on position, nothing turns on like the clock, radio, any dash lights (CEL, SRS, etc) except the door ajar light. so I start checking fuses, notice that my 30A fuse for "AM2" is blown. I replace it with a spare, and get back in. turn the key just to the on, and everything is fine, the lights turn on and everything. then I go to crank and it turns over once and then nothing, it blew the fuse again. So basically my car is blowing the AM2 fuse everytime I turn the key to crank. I'm looking at the wiring diagrams but I'm not very good at diagnosing electrical problems. So any help appreciated on places to look for shorts.