Dash lights
 

I have a 2009 edge and when you turn on the headlights the dash and radio readout go very dim. So dim you can't see the readout. This happens if you turn on the headlights manually or if they come on automatically. Also the dome/courtesy light will not come on with the switch. It does work when the doors are open and closed. Does this mean the dome light/dimmer switch is bad?