How is a voltmeter wired into a circuit?

The voltmeter is always connected in parallel in the circuit because the pressure coil used in the voltmeter is made of thin wire and high resistance. The voltmeter measures the difference between the two voltages of the circuit, which we call the voltage. That is why it is added in parallel order.

What should a 12 volt battery read fully charged?

about 12.6 to 12.8 volts A fully charged battery will typically display a voltmeter reading of about 12.6 to 12.8 volts. If your voltmeter is showing a voltage anywhere between 12.4 and 12.8, that means your battery is in good shape. Any voltage above 12.9 volts is a good indicator that your battery has excessive voltage.

At what voltage is a 12-volt battery considered dead?

12.0 volts Resting fully charged 12-volt batteries are around 12.8-12.9 volts, and flat dead ones are at 12.0 volts, so 12.4 volts on a resting battery means its about 50% charged.