If the output of electric vehicle battery is too low, it is necessary to replace the battery and pull out the brake cable. If the handle is broken, it is necessary to replace the handle or repair it. If the meter 2 and the control handle are connected, it is necessary to replace or repair the handle It shows that the controller is OK. 

Jianyang's method is to smell whether the controller has the smell of burning. Some words prove that the carbon brush contact is not real, which also causes the car to be unable to drive due to a little power failure. The solution is to pull out the power-off switch of the handbrake and see if the brake light goes out. If it goes out, tighten the brake and embroider the brake line. Then the brake switch is broken. Replace the brake switch. It may be that the line is short circuited. Use a multimeter to find out where the short circuit is. In fact, when the line is broken, there may be more breakdowns of electric vehicles. Pay attention to riding safety and know how to deal with breakdowns.