hello all u electrically minded readers...
time to update this thread
and the news is good!
to recap, since august 05 i've not been able to properly plug in
at any campground with a gfci on the shore pole.
the nanosecond the 3 prongs touched connnections,
the gfci would trip...click...no juice.
initally my a/s service dept was told by the factory folks that
a 'gfci could not be plugged into a gfci' ------- so find other parks for camping...
PLEASE! how many ways is THAT advice nonsense?
while in salem the a/s factory guys told me the same thing....yep to my face.
anyway several here suggested a neutral2ground short somewhere in the trailer...
ah but where? and why? and how to find it?
eventually i learned the proper way to isolate the fault was pull each breaker,
then using a voltmeter touch each ground and neutral,
eventually finding the 'open circuit' with the fault.
then each outlet/connection on that circuit would need evaluation.
not only could this take hours, my only experience with electricity is using it!
so while in j/c last week the factory guys finally agreed to bird dog this issue...basically as described above. potentially an all day event.
what did they find?
open circuit was on the a/c breaker...
basically there is a junction box inside the air conditioner housing where the unit wiring is joined to the trailer wiring....
and the cover plate on this junction box had been overtightened in such a way as to pinch/short the neutral wire insulation...
viola! the short was found! recall this started in august 05?
that was when the same factory service department,
installed a new (the 3rd ) air conditioning on my trailer...
seems the short they found was a short they caused!
oh well, these things happen, and i'm just glad they found the problem! i was not imagining this problem! i am properly grounded again!
i can now retire the j/c dogbone (c post #27) since the n/g short cause by j/c in the a/c was found at j/c!
so even the factory finest can short circuit occasionally....
cheers and thanks for reading!