Wiring bug please help!!!!

[6796Chev]

To start things out, I drive a 96 2dr Tahoe 5.7 L that has just recently stared having issues. first off I had an issue with what I though was my alternator/battery..both were replaced with Optima yellow top/100A alt. Secondly there was a coolant leak issue that ended up needing intake manifold replacements. all of which have been done the past couple of days and it still wont start Not that these issues are related. I am trying to figure out why my brand new battery is already dead? Any ideas where a constant battery drain would come from?? BTW it is ACCUAIR E-Level equipped. Any suggestions/thoughts/anything helps.