Electrical Failure
 

Hey guys,
so while i was uninstalling my sub and amp i disconected my battery but after i finished the uninstall i went to reconnect the negative terminal to the battery and the interior lights flashed on then i lost almost all power to the car. right now with the battery hooked up i only have power to the rear seat adjusters and the two 12v plugs in the trunk.... nothing else. i went to my local bmw mechanic and since i didnt have the car i had to describe to him the problem but he wasnt sure what it could be. if anyone has any ideas it would be greatly apreaciated!!!!

Try disconnecting again. Maybe the battery was low, and when you connected it all, it killed itself. Try charging the battery, or boosting the car, see if it will come alive.

so basically i was an idiot. after like 6 hours i traced it to a fuse that i had disconnected.... thanks for the help guys greatly apreciated