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The fan you hear is in the converter/charger. It provides 12 VDC (converted from 120VAC) to power the trailer 12 VDC systems (lights, furnace fan, refrigerator/water heater control boards, stereo, TV antenna amplifier, etc. As you increase demand on the converter/charger by turning on more 12 VDC equipment, the rectifier in the converter gets warm. There is a variable speed fan located in the end of the housing that helps cool the rectifier circuits. It speeds up/slows down depending on the amount of DC power required. More lights, faster fan speed/more noise. Less 12 volt demand, slower fan speed, less noise.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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