I'd like to provide an update on this. As others suggested This situation was caused by a leaking positive battery post that destroyed the positive terminal even though I cleaned it at every oil change (4,000 miles).
My 2017 Expy Limited was covered by Ford Premium extended warranty. They told me that the terminal is not replaceable by itself - have to replace the entire power harness and refused to cover it under warranty. Quoting me "about $800 plus tax) to install the new power harness not including another $140 for the battery.
Others here advised the terminal is replaceable, so I compared the positive terminal attached to a new entire power wiring harness for the 2017 as well as the recommended individual part number positive terminal. They are both identical, though the dealer and Ford computer that they are not compatible.
The positive terminal has the battery monitor as well as a secondary positive power cable bolted vis individual posts and nuts for each. The main positive power cable is crimped to the terminal and not easily removable. The main cable is also too short to cut off the old terminal, restrip the cable and crimp on a new one. BTW The negative terminal has 1 easily removable bolted on cable, which could certainly have been done with the positive terminal.
I unbolted the battery monitor, and secondary cable bolted to the positive terminal and then carefully cut the back of where the positive terminal is crimped to the main power cable and removed the terminal. I cleaned up the main cable and installed and crimped on the new terminal along with several pieces of shrink tubing.
Installed a new battery (BTX-65-850) to replace the leaking (BTX-65-750) one, reconnected all the terminals, sprayed on some terminal protectant and all is well.
I'd like those of you that have had the same issue to post in this thread as I'm going to have a further discussion with the Dealer / Ford and NTSB, who already has a notification open on this situation.
View attachment 70862View attachment 70863