How to wire EZ Track Switch to DCS AIU

[DJP329]

Hi - I am trying to automate a Bachmann EZ Track switch using an MTH DCS Commnader, TIU, and the AIU using the AIU to manage my switches  The EZ track switch has a three wire coming off the track with a plug connector.  I cut off the connector and soldered the three wires onto another set to extend and denote.  I have the middle wire which I thought was common wired as yellow, the right and left as red and green.  I wired the AIU switch with Yellow as the ground and  red as input 1 and green input 2.  I then used the DCS Commander, selected the switch and then using the soft keys attempted to initiate the switch,  Nothing happens - I've switched the wires around to oher configurations.  But still no success.  Can you tell me how ro wire the switch so I can invoke from the Commander ?
Thanks - Doug Palmeri