2 speed to 3 speed wiper swap.

there is additional wire that allows you to convert to electric washer and replace foot pump. brown wire from pump to bulkhead connector and brown wire from inside connector to the wiper switch. this feature only available for 3 speed wiper motor. great feature when my Dart was a daily driver and the foot pump would freeze up in winter and water on carpet!
wiring in shop manual position M on bulkhead