95 Deville low beam headlights quit and drivers window won't roll down
 

The low beam only headlights on my 95 quit working. The high beams work, but you have to hold the turn signal to keep them on, it won't stay on by itself.
I have changed both bulbs, checked the fuses, switched the relays and replaced the main light box on the dash. I also checked the ground.
Most recently the power drivers window only will not work. Not sure if this is a related wiring issue or if the motor burned out in that window, all others work.
Any info would be appreciated.

Dimmer switch?

Thanks. Does anyone know how to change the dimmer switch?