1966 Canadian built valiant custom 200 convertible

Nothing at all when rotating it. I just pulled the dash to check all bulbs, they are all fine. So maybe it is the switch. Headlights are so dim too. There was a fancy new radio put in so I disconnected that figuring it may have been drawing too much?
I’d lean to the switch. As for dim headlights, do they get brighter when revving the engine a bit? If not, the alternator may not be charging.