DOES 12 PLUS 24 EQUAL 36?

A farm equipment dealer has an M880 he bought some time ago at a government sale but no one seems to want. It runs good, but I’m confused because it seems to have two complete electrical systems. There is a 12-volt civilian alternator on one side of the engine and one 12-volt battery. On the other side of the engine is a military 24-volt alternator and two 12-volt batteries. Was this a special truck that needed 36 volts for something? More »