If this is the same way your 24 volt system is connected the starting procedure is quite simple.
Boosting a 24 volt system.
Orientate the vehicles so their batteries are as close to each.
Position the 12 volt truck as close to the 24 volt truck as possible.
However powering remote water pumps for livestock is only one of many uses for your average 12 volt battery.
Even though diesel powered vehicles can have dual batteries or one oversized battery it s possible to jump start a diesel from the battery on a conventional gasoline powered vehicle.
If your diesel won t start due to a dead battery follow the steps here to jump it safely.
It is therefore possible to jump start a vehicle with a 12 v electrical system using only one of the two batteries.
You can power trolling motors electric fences and emergency equipment.
You could how ever put two 12 volt batteries in series and then use that set to jump your 24 volt system there are two possible waysin any case do not use one 12 volt source to boost both.
Jump starting a 24volt truck from another 24volt truck.
It consists of 2 x 1000 cca 12 volt batteries connected in series to give 24 volts.
To avoid confusion these instructions call the vehicle with the dead.
Trucks usually have a 24 v supply using two 12 v automotive batteries in series.
The battery system is connected as in this diagram which is the most common setup for 24 volt systems in trucks and buses.