Assuming the batteries are identical: Mark batteries A, B, C, D
Group the batteries A and B, C and D.
Join A+ to B-, Join C+ to D-. This puts the batteries into a series connection. You now have (2) 24 volt batteries.
To place the batteries in parallel (ie: use all 4 batteries):
Join A- to C-, Join B+ to D+ and use the common terminals A-C- as the combined negative terminal, Use the B+D+ pair as the combined positive terminal.
A combination like this is known as a series parallel connection.
join the positive and negative
wire it in series
To get 24 volts from two 12 volt batteries, hook the positive post from one battery to the negative post of the other.
Depends on the battery size. If your boat is a 12 volt system and you wire two 12 volt batteries in series you then have 24 volts. If the batteries are 6 volt batteries you will be fine. If you have a 12 volt system on your boat and want to use two batteries then wire two 12 volt batteries in parallel. You will still have 12 volts but will have double the amperage available and this will extend the running time of the batteries.
Connect three 12 volt batteries in series. You will triple the amperage but the volts will remain at 12. Click the link
You do not need three 12 volt batteries to get 24 volts, all you need is two batteries. So I assume by using three batteries you want to increase the amperage. Wire two of the batteries in series and then wire the third battery to the second battery in parallel and you will have 24 bolts. Or you can just wire two 12 V batteries in series to get 24 V.
Two in series, two in parallel The link below has a couple of diagrams.
Yes, series the two batteries to produce 12 volts. Tap off of the two end terminals for the 12 volts. Tap off of the series jumper for the 6 volts of one of the batteries. The two 6 volt batteries can not be paralleled in this connection as they will short out.
That depends on what voltage your batteries are,
You can only do that with a transformer. Or you can wire three 9 volt batteries in series to get 27 volts.
You hook them in parallel pos to pos and neg to neg.
Four D batteries in series produce nominally 6 volts (1.5 volts per cell). A 12-volt supply may damage the machine built to run on 6 volts.
The batteries need to be wired in a series configuration. Wire the negative of the first battery to the positive of the second battery, and the negative of the second to the positive to the third. If the batteries were placed in a straight line they will look like train cars, with all positive ends of the batteries pointing in the same direction. The batteries voltages are now added together for three 12 volt batteries making 36 volts.