Floor is vibrating.

[jmcom111]

I am staying in a 2011 Cardinal 3625 5th wheel. on shore power. Weirdest thing. A couple days ago, I felt the floor vibrating like there is something powering. Checked the refrig and don't feel it defrosting or anything. I have a mini refrig also plugged in. I felt the walls and don't feel anything vibrating. I went around the exterior and don't feel anything is on. Now tonight, the floor is vibrating. What can I check.
Thank you ahead

 

[jmcom111]

I am staying in a 2011 Cardinal 3625 5th wheel. on shore power. Weirdest thing. A couple days ago, I felt the floor vibrating like there is something powering. Checked the refrig and don't feel it defrosting or anything. I have a mini refrig also plugged in. I felt the walls and don't feel anything vibrating. I went around the exterior and don't feel anything is on. Now tonight, the floor is vibrating. What can I check.
Thank you ahead

Any suggestions to locate the source. Feels like something is on.

 

[rarebear]

How long does it last? Water pumps could do that. Turn off all power 12v and 120v to see if comes within or outside. Then turn on only 12 or 120v and check again. Might help shorten the list of suspects.

 

[John&Andrea]

Possibly the converter? There is a fan built into the unit for cooling.