So it all started with a battery put on backwards it fried my locking system and some fuses, but now about a week later it snows and my car won't start. I initially think it's the battery so i jump it, it starts up moments later it dies, and no response from any electrical. I put new battery in it nothing, new terminals then it starts up... This time! check engine light is blinking it dies no response....! I have not a clue i need help.