contoller/ battery diagram
 

I have a star Ev 48V 6volt battery's. One of the relays keeps burning up, the Curtis Control is flashing 3,3 code. I replaced all the batteries due to them being 4 yrs old and in poor shape. The unit was not running when i got it, looks like the battery cables had been removed prior. So its unknown at this time if the cables are in the right place. Can anyone help me to find a battery Diagram for this unit to make sure its correct. Or has anyone ran ito this type of problem before. I checked every wire on the unit to make sure there was not a broken wire and causing a short to the relay that keeps burning up. Any help would be great Thanks