MTH E-8 ABA - second A unit not moving

Chances are the slave board blew a motor fet.  Can be repaired.  I do those repairs.  Take shell off Trail A and test AA.  Watch trail motors.  If not rotating that is your issue.  I can be reached via email in profile.  G

Update: I was going to test a bit more. I saw, what I thought was a bit more movement, so I physically pushed it with my hand sever inches and it started moving. Seems to be running now but does need a push once in a while, in either direction. I may still need to get something replaced or upgraded but will see how this goes for a while. It’s good to know you’re there when I need you @GGG.

OGR Rocks! -Bill

2 simple things to try:
1.  Clean the wheels.  I use mineral spirits and Q-tips.
2.  Spray electrical contact cleaner into the tether pins and jack.  Make sure the tether is fully plugged in.

This has revived a few of my engines that I thought had bigger problems.

If the problem persists, try wiggling the tether while running the locomotives slowly.  You may have a failing tether wire.

From the manual for the CW-80:  

Green light begins to flash
The power limit of the Transformer has been exceeded. The unit will gradually reduce power until the problem is corrected.

Likely the current draw of the lead unit was high as it was trying to move the stalled trailing unit.  Also, I would put only the trailing unit on the track and cycle the power to make sure it is not drawing too much current.  It won't move without the lead unit, but it should be drawing very little current.

Bob

Make sure there are no obstructions or anything binding (brake shoes, traction tires, etc.) in the second A unit so that everything turns freely.