I am about to install a 48v tsdz2 without throttle and want to test before installation. On my workbench I have connected the battery, motor and display, not the speed sensor . The display came on when I switched the battery on, I turned the crank,but got no indication that motor was assisting. There was no sound coming from the tsdz2. How should I test it to ensure it's working, before installing? I know with the throttle version you can just check by pushing the throttle.