The fact that it is moving although slow is a plus in my mind. I am sure you checked and the batteries are charged to 48+ V. An easy check first would be the speed sensor which is located at the end of the motor rear of cart. You may have to raise the cart which may not be a bad idea anyway to allow wheels to move freely. The speed sensor is a small black cap held on by 2 screws, the screws should be snug and the cap not moving in and out. There are two wires that go to the controller. Make sure the wires are in good shape, I would check for continuity even if you have to pierce the wires. There is a way to check the sensor but I did not have much luck doing so. The Curtis manual Has a trouble shooting flow chart that may be helpful just remember RnT did not follow the wiring on some of the pins specifically the ITS wiring. I am attaching a schematic that was sent to me. It was prepared by another RnT owner. Check out the Ruff and Tuff Electric Vehicles page on FB and ask to join. Keep us posted on your progress. By the way I changed to a 2 wire ITS and my 1-2 error went away.