Yes. All big trucks need 24v electrics as the engines are far more massive so need more grunt to start them in cold weather.
Two 12v batteries will be connected in series to give 24v, and each pair will then have a parallel connection to maintain 24v.
Heavy duty ultra high capacity 24v batteries DO exist, but are far more scarce in remote locations than heavy duty 12v batteries. A battery pack made of individual 12v batteries is also also much easier from a replacement perspective as a single immense 24v truck battery typically needs a fork-lift truck to lift it in and out; two or three very strong people can also do it but access limitations often necessitate a fork-lift. 12v battery chargers are also much cheaper and much easier to obtain.
Answers & Comments
Yes. All big trucks need 24v electrics as the engines are far more massive so need more grunt to start them in cold weather.
Two 12v batteries will be connected in series to give 24v, and each pair will then have a parallel connection to maintain 24v.
Heavy duty ultra high capacity 24v batteries DO exist, but are far more scarce in remote locations than heavy duty 12v batteries. A battery pack made of individual 12v batteries is also also much easier from a replacement perspective as a single immense 24v truck battery typically needs a fork-lift truck to lift it in and out; two or three very strong people can also do it but access limitations often necessitate a fork-lift. 12v battery chargers are also much cheaper and much easier to obtain.
24v.
How about putting a voltmeter on the batteries if you can't tell if the batteries are connected in series or parallel?