My 99 Chevy sat up for a while and the battery died and when replaced with a new battery the trucks alarm won't go off, and the remotes for the alarm won't work. I did the obvious and changed the batteries is the both remotes lights on remote come on but no response. I was wondering if some had to be reset or to turn the key so far and push the button. What ever anyone thinks will work please reply back. Also I believe that the alarm is aftermarket.