Great running Spectrum 2-8-0 I've had a few years suddenly only runs forward and won't go in reverse.  I'm running DC using a tech-II power pack, momentum is off.  Put the 'dumb plugs' in and it runs ok, put the decoder back and it won't reverse.  Weird.   Anyone seen this before?  Also noticed it seems to run smoother on DC with the decoder plugged in.

One more thing.. the decoder plug pin marked '1' is oriented such that in can only fit in the pc board pin hole marked 8, or 4 if turned around.  If I plug it so pin 1 matches hole 4 it wont move.  Pin 1 in hole 8 only runs forward, no reverse.

Happy Railroading!