<VV> Wiper motor question

[Jim Houston]

Dumb question of the day.  I have set up my wiper motor and washer for a 
bench check.  The motor runs, and has two speeds - my question is how 
does it "park"??  When I remove the ground (turn off the switch) it just 
stops.  In the car, it will continue to run until the wipers are 
parked...  could someone explain?  Or is this motor assembly NFG?    
Thanks in advance

Jim Houston
Palm Coast, FL
'65 Monza coupe