in the february 2021 issue of Mopar action magazine, there is a tech article on wipers. [begins on page 58]
on page 60, there is a wiring diagram at the bottom of the page showing how to retro-fit a 2-speed wiper motor to a variable speed unit, using an e-bag item.
it states the item in question won't work on a 3-speed wiper motor, but as i don't have either here to test, i don't know how true it is. [and i still haven't figured out how to scan stuff on this new wind-hose 11 desk top i got early in the summer. ]