so i recently bought a 02 zx5 and ive been scoping out the electronics on it and checking everything out. ive noticed that when you turn the car off, the radio is still getting 12v power. i dont really like that, is that the way all foci are? im just curious because im afraid im going to leave it on one day and kill my battery. also, there arnt any courtesy lights in the doors, and only that one dome light comes on. is there any way i can add a light to the back and to the doors so my car is illuminated when i go to get in it at night? and on a final note, what are the size of the bulbs in the dome? because id like to get myself cool white LEDs to brighten it up some in there when theyre on.