hey prentice,

First off make sure the batteries are fully charged or have enough charge to run the truck.

you probably want to get your hands on a curtis handset or if you can get hold of "PC programmer" for use with a laptop and plug into the controller and see whats going on, the problem could be either the tiller control or a setting in the controller. Also could be the brake dragging, when you energize the truck do you hear the brake release?

Plus after looking in the operators book it does suggest that there are 2 different modes this control can be programmed which provide 2 sets of speeds it can operate at. It does not say they are switchable from the control handle so i believe this is something that has to be done with the handset.

I would pay attention closely to the control handle, these aren't the best in the world and i've had issues with these they use with this controller in the past and they do break in various ways that cause problems in the truck operation.