road-runner wrote:
The white wire is bonded to ground via the outlet that the shore cord plugs into.
It does not sense current in the ground wire for this feature, either.
I kind of figured the first part out on my own.
In effect, the entire coach looks just like a huge "appliance" to the power grid; the ground comes from the grid, not the "appliance".
And I was wrong about the functioning of a GFI. The main thing sensed is a difference in the current flow on the two supply wires and that really has nothing to do with "ground". It may also detect current flow on the ground wire but that's a plus and not really necessary.....I think. In a mobile coach application, it really is not a "ground fault" detector unless you are connected to shore power.
Thanks for all the answers.
I think I'll take a meter to mine and see for sure what is what when running on generator power.