That is normal, the fan is running to keep the converter cool. Mine used to do the same when I turned on the 3-main living/kitchen lights, but since I converted everything to LED inside, I can turn on every light inside and not kick the converter fan on. The factory lights use way more juice than the LED's and the LED's also run alot cooler as well. Kind of a pricey upgrade, but worth if for me as I occasionally will do a camp walmart for a quick snooze to recharge and it helps to save juice where you can...
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2015 Rushmore Springfield
Disc Brake upgrade, Goodyear G614 tire upgrade
RV FLEX-ARMOR roof, Mor-Ryde IS suspension
2017 F350 Dually 4x4 6.7 Bronze Fire
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