do you hear the electronic brake coil click when you lower the handle? cna you push this truck or are the brakes on all the time?
this truck has a 2 wire molex connector jumper that can be plugged into the harness that allows the brakes to release as long as there is battery power (like for the transport driver to get a non running unit on the truck). but if left connected, the truck will not operate.
do you know of this wire connection? have you confirmed it is connected for normal operation?