When the car is off battery voltage should be about 12.5 volts. When the car is on it should be just below 14 but more than 13. If it is then voltage sensing circuit is lying to you. If not then you must check all connections from battery to alternator and starter. When the car is off, does it drain the battery? If so, something other than radio and computer is using power. Electrical troubleshooting can be very complex are you familiar a DVM? (digital volt multimeter) If not you may decide this is too much for a do it yourselfer. You could damage all the electrical system if not careful.
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