1990 Lexus LS400 headlight issue
 

Good morning,
I have an issue with my headlights and need some help. I can turn on the headlights, all is ok, but when I put the high beams on I lose all lights completely ( very scary when you are in the country when this happens!) I click back to low beams, all is ok. Could this be the headlight switch? I also have no fog lights at all. Thanks in advance.