Honestly I haven't looked at where that black box actually goes/attaches other than it is on the driver side close to where the plug goes to the front door jamb to connect to the door harness.
I'm assuming I attaches to the side wall under the dash and it does look like a junction box. What plugs into it I have not looked yet.
As for the wiper motor, just pm me if n when u need it and I can ship it out. I'm guessing it wouldn't be more than $10-12 to ship.
“Who you are speaks so loudly I can't hear what you're saying.” -Ralph Waldo Emerson.