Ok, minor electrical problem here;

I have a 99 K1500 Suburban, sometimes my parking lights / rear running lights and the interior gauge lights does not turn on at all.
I've tried to swap the headlight switch with a working one and checked the fuses on the side of the dash, number 4, 14 and 20 I think it was and they were all good and still didn't turn on... I am hoping it's not going to be a horrible wiring problem, just something simple...

Does anyone have any idea/clues on what to check next? o that I don't get a ticket lol