Cavdog81

Hello everyone, I have a 2003 Silverado 1500. When the auto headlights kick on, I move the switch to park or to the left to turn off the headlights and I am unable to make it do what I want. The green light next to the auto selection is on. I have tried the dome lamp switch off and on 4 times thing to no avail. During the day with normal light and drls operating, I can use the switch with no problems. Any suggestions how to gain control over this again? I have tried replacing switch assm. with known good operating one and still have the same "issue". Thanks.