My wipers just jammed one day when i went to use them, forcing me to go arm powered ever since. The wiper motor still runs but the wipers just twitch when i turn them on, no other movement, any ideas what could be wrong?

 

Look closely at the 2 round pins. If the pin is turning, but not grabing the arm, first you need to try to tighten (13 mm) nut. If that does not help, you need new arms ($ 33 - $ 35 at FCP).