Looking at the wiring diagram (first image) from my old post:
http://www.suzukiquadracerhq.com/tech-talk-electrical/quadzilla-ledhid-lighting-with-12-vdc/

So, the yellow w/red tracer stator wire and the grey wire coming off of the regulator provide power to your lighting components. You should have access to the connector that is under the fuel tank containing both wires.  These wires go to the handlebar light switch.

I'm not sure if this would work right since your changing half of the AC connection.  The lighting system uses two AC wires to complete its circuit.  You would now have a DC ?positive? (grey wire) feeding the lighting components.  The other wire is still running AC, so would that make all your lights flicker on and off as the AC cycles?  I'm not sure.

Let us know what you find out buddy.