87gtstang

I have a 1996 LT1 and am starting to have some problems that I hope someone can help me with. Lately while I am driving my door ajar light will come on, even though I know that both doors are closed. I am also having problems with my battery going dead overnight. I replaced the battery and checked all of my grounds for corossion and everything was fine. While working on it last night it sounded like my driver door locks were going off. I am getting frustrated and am looking to see if anyone has any ideas of what to do . Thanks for any help.