Can you wire 3 6 volt batteries to get 12 volts?

Yes, you can wire three 6-volt batteries in series to achieve a total voltage of 18 volts, not 12 volts. To get 12 volts, you would need to use two 6-volt batteries in series. By connecting the positive terminal of one battery to the negative terminal of the other, you can obtain the desired 12 volts across the remaining terminals.