I had tried to take the can off my wiper to clean it many, many years ago, and the brushes flew out. I just got around to getting it back together and made a video of it. Of all things, I found a beetle in the sealed part of the assembly! If you want to bench test one of these wiper motors on low speed, hook ground up to the two outside terminals and case, and then hook 12 volts to the center terminal and it'll go after it.