Early A Body Wipers

Early Barracudas came with a variety wiper switches. My car has a variable wiper switch. My wipers will run for a minute and then stop and after a minute will run again. They won't park when the switch is turned off. It is obvious that a breaker switch is causing the problem and the motor may have a problem with the park feature. The question is - is the breaker in the motor or the switch? The linkage appears to move freely.