If the light is illuminated on the unit:
Charger not working – Check power to wall outlet and/or try a different outlet.
Check lights on charger: Plugged into wall = Green, Plugged into wall & unit = Red, Charging Complete = Green, No lights/Blinking lights = Replace charger
Battery no longer holds charge – With no weight on the unit, lift up back end; manually (and carefully) spin rear wheel and press throttle to engage the motor. If Motor engages – Replace Battery
If the light is not illuminated:
Check Fuse – Replace Fuse if blown
Check connectors/wires – Check for loose connections underneath the deck plate and for any damage to the Brake and/or Throttle cables.
If Connections/Wires are okay – Replace On/Off switch