Replacement headlight switch?

[87Skier]

I've been working on my wiring and just started working on the cab and dash lights. Everything is in progress but I wanted to check and make sure you guys agreed before wasting money.

I swapped my headlights on my 72 GMC over to relays, and never got a chance to test the interior lighting before starting on the project. The headlights work perfectly, as well as the marker lights. The dash lights are really dim and I have to fiddle with the knob to even get them to illuminate.

Should I replace the switch? Or is this a ground issue?

I'm not to concerned about burning up a replacement switch since the headlights are relayed.

Thanks
Travis