PS1 ABA unit not connecting?

Open the non working engine and examine the slave board,  Make sure nothing looks damaged and wires all connected.  Check continuity through harness.  G

I opened both engines, inspected all the connections for the wires entering/leaving the engines and each plug seemed to be fully inserted and all wires connected. I also looked at the port on the second train and all wires are soldered on properly.

Everything appears to be connected properly inside and out of the train? 

Any mechanical binding on the trail unit motors?  Did you test continuity between harnesses?  You can run the two A unit without B.

Might be time for a tech to examine it.  G

I don't see any bindings on the motors, I will try testing the continuity.

I have a local model train shop that does repairs. I will take it over there when I have some free time.

Thank you for the help!

Try running as a A-A. This will eliminate some of the cables. If it works the problem is in the B unit wiring.

What Santa Fe are we talking about. Railking would be 2 motors. I have the El Capitan set and that is 2 motors with a powered add on B unit for A-B-B-A.  F3s.

Do you have the PA-1s? 

I have been attempting to run them as A-A this whole time, my first troubleshooting step.

Here is the exact set that i have.

I have that set also. It is from the 2nd run of MTH F3s.

The first run had 2 motors. The 2nd run 4 motors.

Both sets are 2 of my favorites. 

Try putting DC power directly to the can motor of the 2nd unit.

If it worked when you put it away it might be a wiring issue.

If it is the slave board they are available. I think one can be made from a PS-1 board.

I am still fairly positive that either there is something wrong with either the slave board or the wires connecting the engines. The can motors run fine with direct power. The directional lights do not remain lit on the slave unit during engine shutdown as they do on the master unit. 

I can't tell you for sure if this train has run before, last time my layout was set up was 14 years ago, (i'm only 15) but the center rollers do have some signs of wear so it does look like this train was once operational.