I suspect you a WFCO converter unless it has been changed out. If so is is a three stage converter will operate at 13.2, 13.6 and 14.4 volts depending on the state of Charge (SoC) of the battery. So what you observed is normal for a three stage converter.
I leave my Minnie plugged into shore power 100% of the time while in storage. The converter applies 13.2 volts to maintain the battery. No need to use a trickle charger with a three stage converter.
In my 5th the solar system provides 100% of the 12volt power and the converters have been turned off since the solar was installed.
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Fred & Denise (RVM157) New Mexico
2007 Excel Classic 30RSO & 2015 Mini Winnie 22R
2007 RAM 3500, Diesel, 6Spd Auto, SWD, 4x4, CC & LB
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