strobing

ok then my passenger headlamp has decided it wants to be a strobe light flashing on and off when it feels like it tried changing lamps and only when moving any idea on an quick fix? Its a 2000 w220 with hid

Got a weird problem with my left hand side number plate light, it comes on when I unlock the car then goes off and 10 seconds later comes back on again I metered the wire and it shows just under 15v and then it drops to near enough 0v. Has anyone else had this problem? It's doing my nut in and...