Switch? both headlights?
it could be the headlight relay. if not it may be in the switch.
Yes. You would need to wire them up to your running lights.
Proper Use of "Parking Lights"The answer depends on the "Traffic Code" for the State in which you are driving.However, they are called parking lights because they are supposed to be used to warn other vehicle drivers of the location, position, and "state" [parked] of your vehicle.Most jurisdictions prohibit driving with parking lights only. The only exception that might convince a Police Officer to not give you a ticket would be in the case of the loss of headlights out in the boondocks on a very dark night in which you drove only with parking lights to get to a safe place.
With most vehicles you can turn on the parking lights or the headlights and the dash illumination lights light up without turning on the ignition switch.
change the head light swicth
Low beams are burned out.
I would start with replacing the head light switch
the dimmer switch is going out if you are experencing that.
Check the fuses.
Our 1993 Ford would not randomly (or so we thought) shift into overdrive. We eventually figured out this happened when the headlights / parking lights were on. We then traced it to a bad ground in the parking lights circuit. We fixed the ground and the shifting issue was fixed. No joke.
The headlights are a separate circuit from the others. Check the bulbs, headlight switch, Hi/Low beam switch and depending what year you have check the fuses.