I have 2014 Keystone Laredo 30' TT.
Recently, my outdoor plug lost power. Putting a volt/ohm meter to the plug and then to the romex cable, I got no 120v read, just a slight voltage reading.
http://i12.photobucket.com/albums/a205/jdjunkmail/1_zpsk9fmadib.jpg
I traced the cable back into the RV...