There are different ways to determine what volt cart you have.
The easiest way is looking at the batteries.
Each hole is equal to 2 volts
Then its simple math after that. In most carts its x 6.
6x6=36
8 Volt Battery
6x8=48
Some of the newer carts have 4, 12 volt batteries
12 Volt Battery
Same Math 4 x 12 = 48