On Mar 19, 12:04*pm, Terry wrote:
On Wed, 19 Mar 2008 04:15:00 -0700 (PDT), Mikepier

What you most likely have is the 12/2 is "feeding" the light. *The
12/3 is carrying a hot to the switch/GFCI and a neutral to the GFCI
The red is switch leg coming back to the light.

No, when I seperated all the wires, I confirmed the 12/3 is the feed
coming from the vanity light.
I tried to connect the red return wire to the "load" side of the GFI,
but it tripped immediately, which made sense since the vanity light's
neutral is not GFI protected.