Good question....., behind the fuse box there is a converter/charger and the fan is a cooling device for this unit. Once you plug into shore power (your home) the converter/charger is in operation, and depending on the electrical demand placed on the the converter/charger you may even hear the fan operating at a higher speed (normal).
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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