At the risk of labouring a point the GFCI has four wires
connected to it. Active and neutral from the house supply
which goes to the plug receptacles and load wires which
go to another protected circuit, Disconnecting these load
wires will still leave the plug receptacles LIVE.
The varying voltage is due to the fact that you have placed
the resistances of the light bulbs in series by mixing up
the loop wires to the lights and switches.
For example connecting the loop to the next switch to the
wire to the Bulb would cause the current to flow in series
through both light bulbs.
The way the circuit is wired up is Active to light switch
joined to active loop wire to next light switch. Neutral to
first switch joined to the neutral loop to the next switch.
Both switches now have a NEUTRAL and ACTIVE. The
two wires from the bulbs are now connected one to the
NEUTRAL and one to the SWITCHED ACTIVE.

"Donna" wrote in message
...
Can you tell how this bathroom light-switch circuit is wired based on
these
15 highly annotated photos?
http://www.flickr.com/photos/2702997...74838278/show/

The wierd thing is that the CGFI circuits (apparently downstream of the
light switch) stopped working altogether. There is no current in the GCFI
boxes and in adjacent outlets.

Another wierd thing is the voltage CHANGES when the adjacent bathroom
light
switch is turned on or off (but it does not change if I remove the bulbs
from the adjacent light switch).

Can you help me figure out the proper way a light switch should be wired
to
this box?