Turn signal and tail light problem

[Bill Goddard]

I just installed a Signal Stat 900 from Brattons. I had to use the special flasher for my LED lights front and bacl. The problem is both upper and lower sections of the tailight light all the time for all functions --running lights, turning flashers, and stop light (white license light comes on only for braking and there is no change in intensity when brakes are applied)
I would like to isolate the top and bottom sectors of the tail light so that bottom is lit for running, top and bottom come on for stoplite and white light is on with running light. I heard once about a wire you could cut in the tail light (a green wire?) to accomplish this. Does anyone know about this or have any other ideas. Thankx Bill G