JTCompton,
Did you, by any chance, when you first brought it home, disconnect the batteries, clean them, replace them (or some other maintenance) then reinstall them on the trailer?????
Your problem sounds very much like the reverse polarity fuses on the converter may have blown. They are the two red 40 amp fuses located on the converter itself (on your 2007 trailer). On newer trailers, they are located just to the left of the "vertical fuse bar"...
If you touch the battery cables "in reverse polarity" to the battery terminals, those fuses blow to protect the trailer DC systems and converter from damage. Once blown, there is no 12 VDC to the batteries until they are replaced.
From your description, it sounds like your batteries aren't getting charged.
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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