Just to let you know if your battery reads 12V or more. Means nothing. It is the cold cranking amps that matter. All having more than 12V means is that you do not have a dead cell. Not that your battery is fully charged. Having said that. Does your car click when attempting to start it? If it clicks this could mean a battery or starter solenoid. If there is no noise at all. I would check for 12V power at the main starter wire (constant power) and check for switched power at the smaller wire to the solenoid (off then cranking).