Ok so melted Emergency Brakeaway switch replaced, turned on all 12 volt lights when connected to 120 at my house, then turned them off and guess what High Pitched Fan Noise is gone, seems the melted switch was causing the converter to run all the time and saved myself $200 between tolls, fuel and dealers one hour of labor to replace it. I just hope that is all that happens before the big trip in 1.5 weeks.
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2016 F350 Supercew Short Box 6.7 PowerStroke Diesel
2015 FR Rockwood Roo 23IKSS