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I am an IE so I even less understanding about electricity! After 4 reads of the BEMM and not finding a fuse for the cargo lights I found the table showing the BCM outputs.Disclaimer: I'm an ME, not a EE. Sparky stuff scares me.
I have, however, read all 435 posts on cargo lights more than once. As near as I can figure out, it all got changed for 2020. So the helpful information about adding a switch onto a specific fuse no longer applies. Not a solution, but at least explains why the information you've tried doesn't work. I think the cargo lights now run through the BCM (maybe, remember, I'm not a EE).
I just removed the middle lights completely. Easy to do. The clips are on the short ends of the lights and harness disconnects from the main harness easily enough. Eventually I'll probably get frustrated enough to take the rear light out too. Not there yet. Did I mention sparky stuff scares me?
I suppose all things electric are going this way. Less cost, more control and most importantly for Ford, beyond the reach of (most?) people for self repair. It looks like the modem that sends your data home to the mothership in Dearborn is now powered through the BCM. I guess too many people were pulling fuse #32 to disable it. My guess is if I can find it (under headlined?) and unplug it there will be other "unintended" consequences. My hope is that it doesn't communicate if I don't enable FordPass. Also hoping it won't be a parasitic draw. Unfortunately I think the horse has left the barn, never to be retrieved, in terms the consumers digital and repair rights.