no turn signal on one light

And that would also cause the parking light to not work? The one for my car is $80!
1966-74 A B E-Body Turn Signal Switch 1970 1974 A B Body 1971 1974 E Body Models

Is there a way I can test this first?

Also forgot to mention, on the dash it'll show the right signal when on, but not the left (the one that doesn't flash)