Battery car battery electric Why not start

Not start Cause:
Turn the controller line, the motor can not be a bad start, there needs to detect a fault, battery feed, also can not start off the grid.
1; three wheel electric tricycle brake lights normal, indicating that the brakes is not broke, do not consider the power brakes.
2, for turn to, because there are only a small rotation of the magnet and a Hall sensor children.
3, if then turn to the two thread even what can go there, basically your controller is good.
Final judgment is electric bicycle 3 wheel turn to the middle line there is a bad phenomenon -------- from the handle to the controller that a thick black line that [there are three fine line] inside the thin red line or thin green line has a problem, fine black all right, because the fine black if not in contact coaster.