Hi all!
I'm looking for some help - Unfortunately, as someone newer to the hobby, MTH protosound issues seem to be very common. I've had issues with every MTH engine I've owned and now it has happened to my favorite engine, My PS3 Premier Maryland Midland Sd40-2. 
The headlights and ditch lights do not work, in any operational mode, and there are so many plugs I don't know if I plugged them in to the right places. I've provided pictures.
It works in conventional, sound and everything, but is totally unresponsive in DCS mode- it does not show up in the system.
I found a possible short from a red wire that connects to the rear truck (shown) but other than that, there are zero clues as far as I can tell.
I've taken such good care of this engine, and I'm incredibly disappointed that this has happened. Any advice you can give would be appreciated.
-John
