The dash headlight icon does not go off. on 1993 Dodge Ram Van B250

The circuit that includes my headlight indicator pull knob and my radio is faulty, I think. I cannot get the lighted icon to turn off even when the van is shut down. I have to pull the fuse to get the icon light off. It has drained my battery twice now. Any suggestions? Many thanks

Asked by for the 1993 Dodge Ram Van B250