1990 lesebre headlights dont turn on
 

drove with them on on the highway, good weather, got gass. Then went to turn the headlights on, only the hazards went on (everything besides headlights)

When i flickers the brights with the turn signal, brights dont even come on.

I tried disconecting battery but nothing. I dont understand????

I heard it could be a bad ground. Could someone point me in the right direction please. Thanks!