Find the wiring diagram for one of the Mopars around your year for one with the 3 speed wipers. All the 3 speed wipers on Mopars I worked on use a shunt field to control speed along with some resisters built into the wiper switch to add and remove resistance in the shunt winding of the motor. I am sure I have one of my factory manuals with the wiring you need. If you cant get the wiring to easy PM me and I can take pics of the wiper wiring in one of my manuals for you and send them to you. Ron