turn the dimmer switch up.
Faulty ground to the dash.
When i was trying to disable my DRL's (Daytime Running Lights) i pulled the fuse for them and my headlights and instrument lights were flashing intermittently. Check the fuse panel in the glove box and look for the DRL fuse. Check if its blown. Hope this helps!!!
Possible ground issue at the taillights.
Check your fuses! If they're all good I would next check the wireing on your stereo. I had a loose wire once back there and it made my instrument cluster's lights not work when I had the headlights on and I had to guess my speeds at night.
I had a similar problem with a Pontiac some years back. It was a bad dashboard ground. It may not be it, but I would start there.
The instrument panel warning light that indicates the headlights are on full beam is typically a blue icon resembling a headlight with lines emanating from it. This symbol lights up when the high beam headlights are activated, alerting the driver that the full beam is in use. It serves as a reminder to switch back to low beam when necessary to avoid blinding other drivers.
its on the left turn signal switch, at the end is the headlights, then one in is the fog lights, you twist it just like you would the headlights
make sure your dimmer switch isn't turned all the way down. Then check the fuses next.
the dash and radio lights are supposed to dim when the headlights come on. Make sure you have the brightness of the dash lights turned up as much as possible.
If your dash lights are not working while the headlights function properly, it could be due to a blown fuse specifically for the dashboard illumination. Another possibility is a faulty dimmer switch that controls the brightness of the dash lights. Additionally, a loose connection or a burned-out bulb in the instrument cluster could also be the culprit. Checking the relevant fuses and connections would be a good first step in diagnosing the issue.
A bad ground wire will cause dim headlights, or will cause lights not to work.
probably the fuse is blown.