Testing a wiper motor

Mopar wipers are a PITA. There's different motors, and differences over the years.

Try a shop manual,

http://www.forabodiesonly.com/mopar/showthread.php?t=244981

and go here and nose around:

http://www.passion4mopars.com/How-To-Bench-Test-A-3-Speed-Mopar-Wiper-Motor_b_4.html