They make condoms so you don't look like your greased your pants. Been there, done that too.
https://www.amazon.com/Trailer-Hitch-Ball-Cover-Waterproof/dp/B08YY62CRT
After you go through everything with a volt meter and you are still stumped get your dealership to troubleshot your upfitter switches. I had a bad power distribution block and my garage door was going up and down in the middle of the night (truck was off, garage door wired through upfitter).
I have an intersection of wireless death that I haven't been able to sort just yet either, pixel 6 pro and pixel 7. Same behavior you mention and will have to manually reconnect the AA piece, it seems to still be connected to wireless/bluetooth in some fashion but sans AA. Sometimes the audio...
Escalate your issue with the Ford Pass team, specifically tell them your vehicle is stuck in fleet mode.
https://www.macheforum.com/site/threads/mme-finally-arrived-but-cant-activate-on-fordpass-update-fixed-car-had-been-in-fleet-mode.11894/
Typically there is a small gauge blue wire as a power trigger to turn the amp on/off with ignition.
Based on the pics you have though, blue appears to be a 12V positive (hopefully its fused), black is ground. red/black is speaker wire splice, likely to rear the speaker.