I had the same problem with my 02'f350 7.3. Dr ajar and dome lights acting up. I tried all the usually remedies, wd40, new dr switches both sides. which are a real pain to change all attempts to fix the lights and dr ajar. Turned out to be the instrument cluster. cost $700 and must be done...
dome lights
I had the same problem w/ my dome lights not going off. The dr ajar light wouldn't go off either. Turns out it was the instrument cluster. cost $700 and had to be done by a dealer becuase of the odometer.