What does the white wire clip to?

Well I put the headlight switch in park and both directional indicators on the dash are lit up but no dash lights. As I move the light switch in the park position to the right and left the directional indicators brighten and dim as do the lights on my external tach, oil pressure, and temp gauge. What the hell is going on? Should I try replacing the headlight switch check all the connections to make sure they arent fried then reconnect and see? Why do both my directional indicators light up when lights are turned on and brighten and dim by adjusting the light knob but no dashlights? So frustrating.