Does your cart have 4- 12v batteries?
I have 6 - 8volt batteries.
I need a wiring diagram or step by step instructions.
Here is a diagram. This is the way your batteries should be hooked up. Don't forget to use a properly rated fuse.
I have a red face on this one. Somehow I though you 8- 6v batteries, thats why I drew 8 batteries.
I am not aware of a reducer for 4v. A bank of resistors might do the trick but the size you would need would be expensive. It might be cheaper to use 24v lighting in this case.
I can opt out and see if anybody else has any better ideas, but I doubt it.