I have a 2008 JKU I was replacing my exhaust system including the CATS and when I went to start it to check for leaks I had nothing. I turned the key and the engine would not turn over. I had good battery power. I was thinking maybe it had something to do with the alarm system so I pulled J13 fuse for the main ECM for 30 sec. then put it back in but still nothing. Can someone help????