steering wheel nut is a 22 or 24mm i believe, when i had this problem(only on 1 side of the car though)i changed the stalk and all was ok again, r u sure the hazard light isnt jammed half down or something, also check the wiring to the stalks to just for piece of mind, have u checked fuses too?? im clutching at straws here now but hope some of this is some help