Cart is a 1995 club cart DS. It is a 48v cart with Trojan 875 batteries. Last year I burned up a wire on the cart from too much load on it. Anyways, replaced wire from negative of battery pack to controller and now the cart will not move. I put it in forward or reverse gear and step on the pedal and you hear a slight click and nothing. Checked and load tested each battery and they are all at 8volts. I was reading and maybe my POTENTIOMETER is bad? How do I test this?