teddyu wrote:
... ... Even though the GFCI tripped because of a few drops of water inside the converter box, there was in little danger until the component was openned when engerized. ...
This was a direct leakage of AC to the grounded converter box. My ohmeter showed it was a high resistance but it still was a leakage. If the trailer did not have a proper ground then the trailer skin and frame would be "hot". Without the proper ground anyone standing on damp grass outside and touching any metal part of the trailer would get a tingle or a jolt. We have seen that happen often in these forums.