ok, so it seemed like my starter went bad. (turn key and hear a click and no crank) so i took out my starter and got it tested, it passed.. i put it back in and it worked. but ever since, my battery has been getting drained while the car is off. theres no lights on and nothing. maybe its a misplaced ground? i even tried unplugging my aftermarket radio. any help would be appreciated, thanks.

 

One method for checking the quality of the grounds would be with the car running and using a multimeter set to DC volts place one meter lead to the housing /casing of the alternator and the other lead to the negative battery post (not the terminal clamp but to the post) and the reading should be less than .2 volts. If higher then the grounds are not doing their job properly.