Cut into hot wire feeding lightbulb (the swithleg from opener), add
wire, then wire-nut these 3 wires together and use the newly added
wire to fire off a relay w/120v coil. Take hot wire feeding 3way
switch and tap off of it and use to feed n/o dry contacts of relay.
Switched side of relay contact now needs to go over to your other 3way
switch and double up with its outside lighting switch-leg. This
creates a parallel path so relay can turn lights on even if power
isn't comming through snap-switches (relay overrides 3ways).

On 3 Oct 2003 09:23:31 -0700, (Andrew) wrote:

I have a home wiring project that I need help with. Actually I need
to find a device that can control a light, using power from another
light socket, and still letting a light be in that socket.

Ok. I will explain.

I have a garage door opener with a light in it. I have 2 lights
outside my garage. The builder only installed 1 switch to these
lights, so the first thing is to put another switch in an easier
location to access. I can figure out the 2 way switch.

But I want for these outdoor lights to come on when the garage door
opener's light comes on, -ie when the opener is in motion. There is
no auxilary control for this on the opener, but I think this could be
accomplished by using the power to the garage door opener's light to
control power to the outdoor lights.

I would like for this feature to override the 2 light switches, so I
would want them connected in series.

Any ideas? Is there a device that could do this for me available on
the market? Or is one easy to build? I have moderate electrical
knowledge.

Thanks