To verify correct wiring you should have: Battery 1 Positive, to Battery 2 Negative, and Battery 1 Negative to Battery 2 Positive is series wiring, combining the voltage rating of both of the batteries. I suggest adding a "Battery Cut-Off Switch" in the circuit. Some slight arcing can happen if you drag the connectors together.
Try doing it outside your vehicle and use a multimeter set to DC volts and test for 22+ volts.
No, if they are wired in series you have 36 volts assuming each battery is a 12 volt battery. They will have to be wired in parallel to output 12 volts. In that case you can charge them with a 12 volt charger but it will take 3 times as long as charging just one 12 volt battery.
24 volts (although you'll ruin the 12v battery this way). If you're trying to get 36 volts, you want to wire them in series.
Connect two 12 volt batteries in series and you will have 24 volts.
No, you will need two 12 volt batteries connected in series to give the 24 volts necessary to run the pump. It will not run on 12 volts.
That is Impossible. You can however make two 6 volt batteries into a 12 volt system by wiring the two 6 volts batteries in Series. You will then have an output voltage of 12 volts but the amperes will only be what one of the batteries have, In other words the volts will double but the amps will stay the same as if you only had 1 battery connected.
To wire 10 12-volt batteries to achieve 120 volts, you need to connect them in a series configuration. Specifically, connect 10 batteries in series to produce a total of 120 volts (12 volts x 10 = 120 volts). Ensure that the positive terminal of one battery connects to the negative terminal of the next battery in the series. Finally, the output can be taken from the first battery's positive terminal and the last battery's negative terminal.
You will need a second battery in series with the first battery to produce the 24 volts DC. To keep it charged the series connection will have to be manually changed to a parallel connection.
You cannot make a 6 volt battery into a 12 volt batter, but you can make a 12 volt battery out of two 6 volt batteries. Connect two 6 volts batteries together in series and you have 12 volts. Please define "in series".
One is 9 volts and the other is 12 volts. They do not interchange!
No, but you can charge each one individually without separating them from the series loop.
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.
If it is a 12 volt marine battery, then yes. If it's a 6 volt marine battery, then you would need two of them wired in series to make the 12 volts needed to start the vehicle.