I have a new to me MTH 20-20149-3 lighted dummy. It came to me as a shelf queen. It is shorting somewhere.
Taking the shell off and disconnecting the top light connector, when I roll it on the track with 18v, I see and hear arcing around where the motor mount hits the frame. Sometimes at the front truck. Sometimes at the rear truck. The arcing is not constant - I need to move the frame back and forth on the tracks to get it to arc. It usually doesn't arc enough to trip the lionel brick breaker. If I leave it unpowered and roll it connected to a meter to look for shorting (continuity), I get no beeps out of my meter. I've disconnected the center roller pickup wires and grounds off both trucks and inspected. Nothing out of the ordinary. Re-assembed. Still shorting. I've taken one truck off completely and rolled with just one truck. Still shorts. There is no visible shorting location where these center roller connections could be in contact with the frame. The plastic insulator on both trucks is present. All of the other wiring looks factory wrapped with spiral wrapping. Any clue where to look for this short? Thanks in advance. Dave
