The end of the green wire in your photo  goes to the boxes where all
the AC stuff is.  Outlets, circuit breaker, etc.  The black box is
for the wires that go to the water tank level sensors, which make the
lights on the westy panel come on to tell you how much water is in
the tank.  90% accuracy estimate on those 2 answers.  ;)

Edward

At 08:03 PM 3/13/2011, zzyzx wrote:
>I am restoring a 1982 westy that had the rear interior removed by the
>prior owner.
>The Bentley reads that the ground wire (large green wire)  from the
>circuit breaker
>grounds "on body, left side".
>Maintaining a stock configuration is the goal.
>
>Does any have guidance on where exactly it attaches? Photo would be
>appreciated.
>Also, anyone know what the black box is in the photo?
>photo @ http://zzyzx.org/1982poptopsaratoga/index.html
>
>TIA
>Steve