I go to turn on my car and the battery is dead!. How in the world can a 3month old battery go dead overnight!!! I mean, all of a sudden. I used the car yesterday, now it wont start. What could have caused this?

 

Put A Hot Battery In It And See If It Sparks When You Hook It Up...if So, You Have Something Pulling Current Off The Battery..(with The Key Off Of Course.

 

Do you have an Amp for the stereo???? Did you use the light on the rearview mirror and forget to turn it off?????(that was mine) Or it could be a bad battery.. Have it load tested...