On Wed, 23 May 2007 07:10:11 -0700, RW Salnick
wrote:

That is not enough - it removes the hot side connection, but the neutral
and ground connections remain. If the appliance has a leakage path
between neutral and ground, opening the breaker will not change
anything. Unplug everything.

Thanks, hadn't thought of that issue, interesting. I understand your
point but unfortunately I have a *lot* of hardwired stuff that doesn't
plug in at all, or the plug is inaccessible without major disruption.

I believe that I've finally found the bus bars where all of the
neutrals and grounds terminate. They are behind a panel in the engine
room instead of being near the breaker panel where you would think.
By lifting connections circuit by circuit at the bus bars I think I'll
be able to isolate the cross connect issue, as well as being able to
identify which is ground and which is neutral. Stay tuned!