ive had this car certified ford used bought off the lot. tonite, when i try to start my car tonite, the dash lights flicker. the engine does not turn or nothing, but like i said the dash lights flicker on and off fast and my locks lock and unlock.....could it be the battery?? ever since i got the car the screen in dash would say check charging system, and a guy at the car wash said it could be because i have corrosion on the battery and to pour coke on it but i never did that. when i turn on head lights they come on also....but car wont start, engine wont turn, dash lights flickering. any1 got any answers???