On Sun, 23 Sep 2007 09:46:32 -0400, "Armond Perretta"
wrote:

Some expert here may know of a method for "multiplexing" 2 wires to
control 2 separate bulbs. I am pretty sure I remember something like that
from long ago.

It's easy. Use a double pole double throw (DPDT) switch with a center
off position to reverse polarity on the two wires, diodes at the top
to figure out which bulb lights up.