Hello, I have an electric ride on mower, but thought this be the best place for help as I think the controller is similar to those on electric bikes. The under voltage light has come on and so it will not work, does anyone have any advice on how to diagnose the fault? The controller has 15 wires wires comming out of it, is rated at 36v 60A . It's has a brush motor. I don't have a wiring diagram and the mower is unbranded, of Chinese manufacture and no longer made. The battery indicator lights shows fully charged and I've checked the voltage with a meter, not sure what else to do!