I am working on creating my own ALDL USB cable for my ZR-1. I bought a FTDI USB cable off Ebay and a 12 pin to 16 pin convertor cable. I cut that in half and am trying to hook up the FTDI USB cable to the 12 connector. Issue I see thus far is the 12 PIN connector cable only has 4 wires. They are BROWN, RED, ORANGE, YELLOW.Does anyone have any idea what wire is ground?