Quote:
Originally Posted by Captainf2
Have you had you 12v batteries load tested. The furnace works of the 12 volt system through the inverter, colder Temps can lead to battery issues
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Yep, CONverter.... But, to add to this comment, the OP's problems seem to occur "only at night"... Considering that "at night" there's also more 12 volt demand from lights, vent fans, range hood fan, water heater operation (controlled by 12 volt system) as well as the colder temps causing greater 12 volt demand to operate the furnace longer and more frequently.....
All that "extra battery power demand" could likely be affected by a bad battery and be "masked by furnace problems that don't directly point to the battery"...
I also would recommend pulling the batteries, taking them to be load tested and confirming that there's no issue with batteries....
AND: While the batteries are disconnected, use a volt meter to confirm that there is 13.6 VDC at the battery cable connections which will verify that the trailer CONverter output is correct. If that voltage is higher or more likely lower than 13.6 VDC, there's a problem with the CONverter output, and quite likely not a "furnace or battery issue" although that CONverter problem may lead to (or already has) damaged the battery or batteries .....