I have a 1999 ez go electric golf cart it will not run, batteries are new, and all wiring is new?

heres what happened, i used it all weekend and when i was puting it away up some ramps into the back of the truck it would not climb, the angle was to much. so i got off of the cart and used my hand on the throttle and it started to go, once it got to the top it just kind of stoped and sarted to fall back, when it got to the bottom i tried it again but it would not move anymore, the batteries are new and fully charged and i checked all of the wires and i have power coming to all of the wires, the rod that is attached to the gas pedal haspower to two of the four wires, one other thing is i think that i smelled somthing burning from the controller, it is a 1999 ezgo and has a controller that says RUN and TOW MAINTENCE. any ideas from you guys. thks