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The fan in the converter should only run when the trailer is plugged into shore power and only when there is a heavy draw on the battery or the battery is in a very low state of charge. Never let the battery drop below 12 volts as it will shorten the battery's life. Normally the power jack is connected straight to the battery, if factory installed, and does not go through the main power switch, it has an inline fuse.
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My Great Wife Joyce
2018 Jayco Jay Flight 21QB
Formerly owned 1705T and 2310H
2012 F150 4X4 SuperCrew EcoBoost w/Leer Cap
Reese WD Strait-Line Hitch
Amateur Radio K3EXU
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