Yes, the thing that's connected to the motor cable.Centralina?
We haven't got a lot to go on, but it looks like one of those scooters, like the Eskuta. See the rusty chain and single speed freewheel. Those scooters are always blowing the controllers because they slow right down going up steep hills and you can't really assist them with the pedals.Brushed or brushless hub ?
If brushed might be worn brushes ?