D125 lights switch acts as cutout!

More help required chaps.
On my D 125 main headlight comes on fine when riding along the road but if I put them on when stationary acts like a cutout!
Any clues people?
Bolti
On my D 125 main headlight comes on fine when riding along the road but if I put them on when stationary acts like a cutout!
Any clues people?
Bolti