Wiper question

Intermittent, heck I would just be happy with a 2 speed wiper on my 65 Dart. I did put in a 2 spd switch recently (because it worked and had the washer terminal), but just jumpered the 2 terminals together so still 1 speed. I am pondering putting an in-line resistor on the first speed to make is a "low", maybe using a ballast resistor, but don't want to stall the motor. Not a priority since I live in CA now.