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You swapped out both batteries since you noticed this issue? Or are they just newer (same batteries installed since you went on holidays?) … just make sure they are fully charged by a battery charger.
I don’t believe the extra juice from the Auxiliary battery is an issue but because of the PCM/IBS management issues, I can’t guarantee that it isn’t. As long as the main battery was the same, it doesn’t need recoding… but did need registering.
As a note, there is no option to register the Aux battery on my 2018 F15.
Have you had your head unit out for any reason? I was not able to find any OEM diagrams, but most aftermarket systems go to the back on the head unit… so curious if it’s been out anytime recently?
There looks to an inline plug connector in the trunk lid behind the camera for easier replacement if it was damaged… another connection that could have come loose?
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