Sounds like it could be a bad battery. If the previous owners abuse the battery and regularly ran it down to dead it could be done for.
When you are plugged in, use a multi meter and touch the battery terminals while it's charging. You should see at least 13.5V if not 14.5 depending on which converter you have. If it's still showing less than 12V then you can assume the converter is not charging the battery.
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2013 F-150 EcoBoost MaxTow, Roush tuned (415hp 506tq), lifted on 33s, R.A.S.
2013 Jay Flight 28BHS Elite (Equalizer 10K hitch)
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