Just for my own clarification, even if no onscreen error the alternator is sending full voltage at the battery all the time if you use ForScan to eliminate ASS?
I have not tried it on any 4th Gen Expedition, but on other Ford platforms the current version, and few previous of FORSCAN can disable ASS without turning off BMC(I incorrectly said BCM in the previous post). If it was done using the old method, which was the only way available at the time of my linked post, it disables BMC. Which means the vehicle does not think it can monitor Battery voltage, so it sends full voltage all the time. The side effect, is that one of the required pre-requisites(Acceptable Battery to restart) isn't met and ASS does not engage. Basically you are turning off a useful system, to disable an annoying one, that Ford was nice enough to give us a button for.
Again, the new FORSCAN might be able to do it the right way, but I have not tested it. You would need to know the code location for the BMC disable and make sure that bit does not change when you use the drop down option to disable ASS. If it doesn't and ASS indeed does turn off, then FORSCAN is a viable option for this platform.
The big thing that EVERYBODY needs to remember. Ford is NOT keeping the programming and module config the same in a generation or even a model year anymore. That is proven by the fact that the 18/19's programming is different than the 2020's, and the 2021's even have a few small tweaks. With the chip shortage, Ford is making more changes even more often. On the 21+ 150's we are seeing changes after updates. Not only does the module matter, but the version will too. I haven't seen the modules on a 22 Expy yet, but I expect them to more closely match the 21+ 150 than the 21 Expedition. You change a bit based on previous coding, and if you did not back up, you could be REALLY sad. There is nobody that I am aware of mapping differences between the versions in this community, like there is in the 150's. With Russia and Ukraine and the FORSCAN developers being in Russia, there is risk of less and less support(They can't get paid). If you are on a 22, be very careful of the changes you make, and BACKUP before every change.