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.
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
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.
make sure your dimmer switch isn't turned all the way down. Then check the fuses next.
A bad ground wire will cause dim headlights, or will cause lights not to work.
well i bought new lights for my instrument cluster thinking it would fix the problem but there still dim
probably the fuse is blown.
I would replace the headlight switch as Ford has had their share of these problems.