1988 Mercury Marquis lights

I have aproblem with the parking lights. The light switch has an auto on function with a light sensor in the front dash. I have replaced the origianal switch and problem still exists. I am looking for a detailed wiring diagram and advice.

The parking lights do not come on with the headlights in the automatic setting. The parking lights do not come on with the knob pulled clear out to turn the head lights on. With the knob pulled out half way you can get the parking lights to turn on. IIf you pull the knob out half way to get the parking lights on AND turn the headlights to automatic you can have both light sets of lights working. The problem stayeed the same with both the old ond the new switch.