QUOTE(jakejm79 @ Oct 12 2008, 02:17 PM)
It is possible but picture quality could suffer due to interference, for video signals to reduce the interference to the signal the signal wire is normally surrounded by the ground wire (i.e. coaxial), also having individual ground wires for each part of the video signal is ideal, but my cheap HD xbox cable used a common ground. So try it out and see, but if the picture suffers from interference then that is probably your source of it. Also I would consider using the wire shielding for ground vs. just the black wire, therefor protecting the signals from outside interference (but they would still be able to interfere with each other being surrounded by a common ground and not there own).
Hmm... So I think the best option would be to use the black one for ground to the Green channel, and the shielding as a ground for both red and blue channels since both are almost the same signal. Hmm I think it might work.
Ok so all I would need is a couple of Component/RCA jacks and a switch. The switch would be easy to install. Just a switch with 3 terminals, the middle one would be the common ground for mode select, then one side with the HD mode pin and the other with the Advanced mode pin. There is a set of pins that both modes use by default, so I just need to bridge them together and hook up the switch the way I want it.
I'm gonna do a diagram and see if my design works.