Electrical is gone

What wires to I test for in the light switch? The headlights were on and the only wires getting power were the pink and black w/ tracer. Basically, how do I test to see if the light switch is working properly? Also, is there a flasher mounted to the back of the gauge panel on a 72 Dart?

EDIT: Scratch that. I can get a new light switch for $15 so I'll go ahead and do that tomorrow. Even if it's not the current problem, the corrosion on the current one will cause problems later on.