headlights only work when revved ?

the headlights only work on my aerox once revved and then totally go out at idle ...could it be the regulator ...i have just changed the crank so could it be the stator ?

 

does your main beam work?..

 

Is the battery fully charged?

 

sorted it was because i disconnecter my starter motor be cause i didn't need it and that must of completed the circuit at idle ...so connected that and it was ok again