Tom,
I wish you would stop for now and go buy a $9 product from Depot or Loews.
The little device is what you need to check just about every aspect of power
and the little device will prevent you from discomfort or injury. With it
you can check any ac voltage in the trailer, your house, every thing.
I want you to buy a Greenlee GT-11 Pocket Non-Contact Voltage Detector. Here
is a link so you can actually see it. It is like a large ball-point pen.
http://www.greenlee.com/product/gt-11/start.html
-Eddie-
Houston, TX