50 ~ volts in door/doorframe, intermittently

Thanks Matt. I appreciate your input. My only dilemma now is that everything is functioning perfectly at the moment, and has been since last Friday. With that said, everything I test, grounds, polarity, continuity, etc etc, tests out fine, no problems. Other than visually inspecting connections and tugging on wires, I'm dead in the water unless I can get that "open ground" reading again on my tester and pick up some voltage running through my door frame or elsewhere that it shouldn't be. Whatever I test, it's going to show that all is well with the ground, because at the moment, all IS well with the ground.

You should come down, the sun is shining and the water is warm my friend!