I had a 97 F150 with the same problem. Per internet advice I removed master light switch from steering column and cleaned the green corrosion. This gave me my highbeams back. Later when I had $100 for a new switch, I replaced it and the headlights have been working fine ever since.
Headlights, interior lights, parking lights,Headlights, interior lights, parking lights,
Bad door switch or bad headlight switch
Perhaps you turned on the interior lights when you were adjusting the headlights?
You probably turned them on by accident. They are controlled with the same pull switch that turns on the headlights. By twisting the switch to the far left it will click and the dome lights will turn on, by twisting it to the right it will turn off the interior lights and will then dim the dashboard lights.
should be with the head lights as an alternate switch or in combination with headlights, move switches in different combinations to see if you can get them to turn off
Headlights,interior lights stop working.checked all fuses. I would suspect the headlight switch and/or the electrical connection at the headlight switch is faulty.
If the interior lights stay on while driving on a 2002 Impala, there could be a problem with the headlight switch. Check the relay center for the headlights that is just behind the headlight switch.
It sounds like a blown fuse or a bad head light switch
Check for bad ground
Have you tried the dimmer switch? It is usually located next to the headlights switch. On pull out headlight switches, rotating the switch itself clockwise or counter clockwise is the dimmer switch and interior light switch.
Check the fuse for the headlights. It is probably open.
Check fuses if there is one specific for the lights (not interior) Find it funny that both would burn out at the same time so would imagine it is in the switch.