Audio Systems: radio mest up system, double wammy, battery cables

Question
Wired a new radiohad an alarm chime and all interior lights stay on. removed fuse disconnected battery cables and reconnected them, now car will not start  help 1993 pontiac grand am

Answer
This a double wammy, one = radio /alarm and 2 = car don't start.
I can only advise putting everything back as it was and checking all the fuses before re-doing the job and do ONE thing at a time and check it's O.K. before proceding with the next step. Sorry can't be of more help but the question is a bit vauge.