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Reply to "Help with TMCC conversion on Lionel 6-28255 SD40T-2"

Yes, but you need to see specifically what they have going on at the PCB for the lights.  Typically, three wires because one set is the Head lights, but another is a jumper to run the rear marker as red when in forward, and vice versa when in reverse.  Front markers come on in Reverse.

Or it could be a different scheme.  How did the lights work before conversion?

It can be done, with a current limiting resistor, but you will need to get into the details of what is on the PCB.  G

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