I'm having an issue with an MTH Imperial Allegheny PS 3.0 (item no 30-1615-1). If I place the engine and tender on the track with 18VAC and the draw-bar "unplugged", I have no issues. But as soon as I plug the draw-bar from the locomotive into the tender, this causes a short.
Realizing the issue seems to lie within the draw-bar, I checked continuity between each of the pins. I measured continuity between the two pins shown in the picture below.
Assuming I should not receive continuity between these two points, I unplugged the draw-bar JST connector that mounts to the locomotive frame. After doing that, I no longer measured continuity across those draw-bar pins. My guess is the issue lies some where in the locomotive.
Any ideas what might be going on?