Hi Greg,
I will end up using the LGB Double Heading feature (what I think you are referring to) with my next MTS project (F7 ABA & ABBA's).
The reason I did not want to use double heading with the 23900's was because I wanted to keep the ability to use the keys to control the front and rear uncoupler but only one of each.
Once I got the loco apart I realized the solution was simple because the cables from both front and rear uncouplers were close enough to swap them.
If I understand double heading I would have to select back and forth between the locos to control a single uncoupler but by giving them the same loco address I think I am getting the benefit of single button front or rear uncoupling. I must have rewired one loco at some previous time because it runs backward without being programmed to do so.
I just unplugged both rear uncouplers and plugged the trailing loco's front uncoupler into its rear uncoupler socket.
Now neither rear uncoupler works and the front uncoupler button is uncoupled as the "front uncoupler" but the front of the rear loco's uncoupler is uncoupled as the "rear uncoupler."
It is similar but a bit more complicated than my analog LGB 21900's because the analog locos work straight from the track polarity and track voltage.
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Unfortunately I have now run into a totally new problem.
The F8 key switches the 23900's from normal to half speed BUT it also switches the LGB 65002 Sound System on and off. This means that when I select half speed for the locos the sound quits.
Someone was not thinking at LGB when they did this.
http://1stclass.mylargescale.com/JerryMcColgan/65002.pdf
Is there any way to disable the F8 sound switch on the 65002?
Thanks,
Jerry