My 1999 Pontiac Grand Am SE 2dr 4cyl automatic transmission is messing up. When I open a door, bump in to it, turn it on or do anything that involves electricity the car lights start flashing and clicking and if I hadn't turned of my alarm horn it would beep sometimes. It will even start flashing when I come to a stop light, and the engine is still running. It does this every time! My pass lock light on the dash is constantly flashing. This all started happening a few months ago when I let my friend drive the car and the battery just died, I replaced the battery but we accidentally grounded it when we hooked it up (positive to negative and negative to positive, big spark) Did I completely mess it up and is there anyway to stop the flashing and clicking? It is driving me crazy. I have to turn my headlights on during the day so people will not think I stole the car.