the headlights on my 73 only open with the manual switch under the steering wheel.....the light switch only turns them on.....it seems that the vac. is working due to the manual switch....is this an indicator the light switch is gone?... it also seems the headlights "wink" ( open a little then close)when it is started.....not sure if that is normal or an indicator of a bigger problem.thanks for the time.