I did this over the weekend. I started by trying this on a wiper motor I had sitting on a shelf before I crawled under my dash and tested my wiper motor that is on my truck. Both work perfectly!!
Since I didn't have one of those fancy connectors to add 2 connectors on that second terminal, I made something that does the exact same thing. Just put 2 wires in the connector, and then added some bullet connectors, works just as good and is something that everyone can get.
One thing I would do differently if I did this again, would be to make the power and ground wires longer, that way I could just plug it into the wiper motor in the truck, and then be able to connect it to the battery, and not have to add some leads to make it long enough to connect to the battery on the floor, and the connectors that barely hang below the dash.
I really appreciate all of the information that is on this thread, it truly helped me a lot!!