Hi, it's pretty well known that we should check the camp ground power supply when we hook up. I have almost always had a polarity checker in one of my kitchen outlets. I also have a Kiil-a-watt plugged into a kitchen outlet so I can check cycles and voltage. When I connect my shore power cord, I either ask my wife if the two yellow lights came on, or I go into my trailer and look myself. I do this before we turn on anything that runs on the 120 volt system. My brother checks the polarity at the power post first, before connecting the shore power cord. So today I bought an adapter so I can check polarity at the post.
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