We continue to experience a loud Hum coming from our Surge Guard Transfer Switch 40-0250 which is located on the bedroom floor under the dresser drawers. I have received several comments from other members and appreciate your input, but no real solution from either Fleetwood or TRC Industries. At this point I am considering re-locating the Switch from inside the coach to somewhere in a storage bin, probably in the utility compartment with the other components. I am looking for input from other members as to whether their Southwind or Bounder has the Transfer Switch located in a storage bin, and if you hear the Hum inside the coach. Thanks for your comments.