Windshield Wiper Switch

Hello All! Well, finally got around to getting the wiper linkage hooked up and the Old Dart is now an "all weather vehicle"! Only thing is when I turn the wiper switch to the off position the wipers stop wherever they were at the time the switch was turned to "off"? Any ideas? Thanks in advance! 4770 miles on her since November 2016! Gotta love those old Darts!!!!! Would not trade it for brand new one!!!!!!