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Yes. That is the exact way to troubleshoot this problem.
No DC power. Shore power good.
Take a multimeter. On shore power, check each post of your red 50A self resetting circuit breakers near your batteries. They should all read the same (about 12.4vdc).
Now remove shore power. Check them again.
Which ever one is NOT showing 12vdc on the post, it is bad. Replace it. Available at your local auto parts store.
Note: charging is also possible via the 7 way cable. It could be supplying power on the same (good) side of the breaker.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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