If your batteries are lead acid type, and if they were discharged over the winter and if they were subjected to freezing temperatures while they were low charged/discharged, then the plates within the batteries may be warped and damaged beyond the ability to hold a nominal charge.
I'd take the batteries out of the trailer, have them charged on a known good charger and load tested to see if it is the batteries (most probable cause of the problem) before digging into the trailer systems.
That said, keep in mind that if the trailer has been in storage for the winter, there's always a chance that some "critter family" may have invaded and damaged some of the wiring in the trailer.
After taking the batteries off the trailer, a "quick check" of the converter/charger system is to measure the voltage at the battery cable ends. WITH THE BATTERIES DISCONNECTED, the voltage on the battery cable terminals should be 13.6VDC. If that's your reading, I'd suspect it's a battery issue, not a converter issue.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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