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.
I would replace the headlight switch as Ford has had their share of these problems.
It's a relay. Which one it depends... I would start from testing headlights relay.
replace the head light switch you may have a bad wire or a faulty dimmer switch.
the radio is wired to the headlight power supply wire, that's why it will only come on when you turn on the headlights. my buddy did this to his truck in the best buy parking lot when it was getting dark out.
dimmer switch below light controls is turned down? i have an 05 and that happens when the dial has been moved. hope that helps
The headlights place a larger load on the battery and cause the voltage to drop enough to dim other devices slightly.
The radio display is usually tied to the dash board lights. As you raise or lower the illumination on the dash, the radio lights should change. During the day (with your headlights off), the radio display is at full brightness so it is easier to read in daylight.
Probably because the dimmer switch is turned off. Turn the dimmer switch up and see if the dashlights and radio illumination lamps come on.
if you have no headlights the battery is dead or one of therminals is very corroded.
The instruments light dim for night driving when the headlights are turned on. Check to insure that your dash dimmer switch is on high. If it is, then you have a problem with either the dimmer switch or the wiring.
Most likely, the dash light dimmer is turned all the way down. That particular dimmer only comes into play when the headlights are turned on. Try turning it back up. did you find out what was wrong with the dashboard im having the same problem