By the time the contacts in the light switch get to that point, it's better to replace it, not tinker with it. There's a dimmer resistor that controls the dash light brightness by turning the knob through almost one full turn, and it also turns the dome light on and off. This resistor will also get replaced, as it's part of the light switch assembly. Don't forget about checking the dimmer switch, as the current to power the headlights also passes through that one on the way to the lights.
Jerry
