When the knurled ring is at 
push
the lever towards the dashboard (stable position).
The warning light 
on the instrument
cluster will come on.
Pulling the lever towards the steering wheel again, the main beams are turned off and the dipped beams on.
See also:
Steering
...
Checking the charge
The battery charge may be checked through the indicator (where fitted) set on
the battery cover and acting according to the colour the indicator shows. If the
battery is not fitted with electrol ...