Converting old MTH F3 set to ERR Commander TMCC - help!

You can wire it up to default to reverse, it's as simple as swapping the motor leads.  For the directional lighting to be correct, swap the lighting outputs as well.  You can also dispense with the lash-up and just address them with the same TMCC ID if you wire them that way.

gunrunnerjohn posted:

You can wire it up to default to reverse, it's as simple as swapping the motor leads.  For the directional lighting to be correct, swap the lighting outputs as well.  You can also dispense with the lash-up and just address them with the same TMCC ID if you wire them that way.

Excellent. Thank you. Can I reuse my existing PS1 coil couplers too? Would hate to have replace the coils...

The PS/1 couplers work fine with TMCC, if you ever convert a PS/2, I'd change those.  They're much lower impedance and draw excessive current from the little coupler triacs.

If you program it corrected as a TMCC lash-up, the rear locomotive will start backwards like you want it and the lights will work correctly.

sinclair posted:

If you program it corrected as a TMCC lash-up, the rear locomotive will start backwards like you want it and the lights will work correctly.

Right but that doesn't solve the issue with conventional. I think gunrunnerjohn had the right solution. Flip the leads to the motors and lighting in the rear A unit and then it can work stand alone in conventional or command or as part of the entire ABBA consist in sequence - regardless of power environment.

But, now that I play all scenarios in my head, yours also makes sense as well, because if I do run them together as the same ENG I'm going to get horn blasts from both A units and different unique sounds falling on top of one another, whereas with a lash-up, you get the correct balance of prime mover in the leader and the trailer, but your horn and other sounds come from the leader.

So, using both of your recommendations, if I wire up the trailing A unit in reverse, but also assign it as another ENG ID, I can run it as part of the ABBA in lash mode with correct sound placement, or stand alone in TMCC as for example just an A unit with a consist, simulationsly with the remaining ABB and its own consist separate as two different trains. This means that in conventional, as part of the same ABBA, they will cycle e units in sync and directional lighting will be right. 

All I have to do is remember that my trailing A unit is flipped. It will always start in reverse and I just eliminate the need to press DIR when creating the lash up. 

Excellent. Thank you both :-)

DdotCdot posted:

All I have to do is remember that my trailing A unit is flipped. It will always start in reverse and I just eliminate the need to press DIR when creating the lash up.

Correct, you can run it as a lash-up or with the same TMCC ID#.