1999 Mercury Sable I NEED LOTS OF ANSWERS BUT I WILL SETTLE

Ok this is gonna be long so read it when you got a minute. My wifes Sable is really starting to break down but she refuses to part with it, so I'm stuck looking for answers. 1st the car battery drains overnight, but its not the battery or the alternator we did a drain test on it with a test light and it has a drain somewhere. We pulled ALL the fuses inside and none of them stopped the drain, we started on the big fuses under the hood we found the fuse that would stop the drain but when consulting any books and the fuse box lid it lists this fuse as nothing. We have stopped the car from draining by pulling this fuse everynight until I can track it so far we have discovered this fuse when pulled makes the brake lights not work along with the windshield wipers, the dome light the rear defrost, the power windows, the radio, and apparently the keyless entry and GEARSHIFTER! Because as long as that fuse is pulled you cant use the keyfob or the key to unlock the car but the button inside works? Also you can start the car but you can't push the button on the shifter to take it out of park. I have tested all these things (except the gearshifter and keyless entry since I don't know how) to see if the drain is coming from one of them, but it's not. WHAT AM I MISSING HERE! Also my wife locked the car right befor I pulled the fuse tonight and I didn't know since she popped the hood for me when she got out, now with the fuse out and the doors locked I can't get in it to pop the hood to put the fuse back to UNLOCK the doors. Is there any way to pop the hood from the outside of the car?