I am currently installing the Electric Railroad Company's AC Commander in a Lionel L3 Mohawk, no. 6-18009, that came out when Lionel was still using the PulMor motors and first adding digital sounds to their steam locomotives, circa 1991. Everything seems straight forward except the motor has a couple of extra sockets at the back with a black wire that runs from one, in through the cab, and plugs into one of the sockets. Apparently this plug and socket system was used instead of the lever on the E unit?? At any rate, after I had hooked up the AC Commander I get normal lighting functions but no response from the motor. I suspect that connecting the outside end of the field wire to the ground is what needs to be done but am hesitant to try this for fear of damaging the Commander. Anyone have any information/ suggestions?