I recently purchased an MRC Prodigy Wireless DCC system. I have been running one diesel locomotive (with a sound decoder) on the manline track without difficulty. The sound is incredible! Today I tried adding an MRC Auto reverse module AD520 to my layout. But when I plugged the Command Station into the power, the green pilot light on the Command Station failed to go on. I then disconnected the power, and disconnected the reverse module. I plugged the Command Station back on and the green light came on and I was able to run the locomotive. Placing the locomotive inside the reversing loop also worked fine. I then disconnected the power to the Command Station and reconnected the reverse module with the two red wires going to the mainline and the two yellow wires going to the track in the reverse section. But when I plugged the Command Station into the power, the green pilot light on the Command Station still failed to go on. I have two terminal tracks, one inside the reversing loop and the other on the mainline. I attached the two red wires to the terminals on the mainline track and the two yellow wires to the terminals on the reversing loop track. It seems that as soon as I connect the reverse module to the layout I am shorting out the entire system and the Command Station fails to turn on. I would appreciate any suggestion or comments. Seasons Greetings to All.