If it was running alright before then I would guess FCA. How many miles on it? You can test it by starting the truck then unplugging it temporarily. If the tone changes and sounds more like a 12v then it’s not your issue. You don’t want to leave it unplugged for more than 10 seconds or so.
You can remove it and if it rattles then it’s bad as well. Buy from Cummins not dodge
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