1964 Valiant "Get Runnin & Drivin"

That’s not stock?
:rofl:

Perhaps the switch is twitchy or gets to hit for good electrical flow? Or the wiper motor itself isn’t right.
Knowing the system is simple, the last thing in the area is the ballast. Cracked porcelain?

Good luck Bobby.

Hell I aint familiar with these things. The wiper system has a ballast? Where is it? It does act as if maybe it's heating up and quitting.