I have the ceiling box open for my kitchen light fixture (getting
ready to paint.) With no load across the leads that feed the ceiling
light and the switch off I measure 47 VAC. If I put a 60W bulb across
these leads the voltage goes to zero. When the switch for this fixture
is turned on I get a normal 120 VAC.
Can I assume the 47 VAC is just some coupling from an adjacent
circuit into a high impedance load?
FWIW, this light fixture is serviced by two three way switches and the
color coding does not follow any standard I have seen (there is no
red wire that I have found yet.)