hey does anyone know how many volts the battery is suposed to have while the engine is running mine read past 14 and once i turn on the lights it drops to 14 then some times the voltage drops close to 12-13 and the car has trouble staying on and i can't have the lights, music and heater on at the same time when this happens or else the car starts dying on me, i also received an electrical shock after i touched a spark plug wire when the volts had dropped to 12-13, but at 14 or more volts everything is fine