Hi Fred, Thanks for the reply and info.  Yes, the 4-6-0 wiring is a factory installation and is very similar to the C-19 diagram that you pointed me to.  Although the diagram showed the 16 wires between the tender and loco it did not identify which wire carried which signal.

I was able to tease out the motor the headlight wires with a multimeter and some continuity checking and those are the only ones I need.

When I am finished with this project I will write up the details and post them here for anyone else to use.

Steve

Although I do not know if this is the newest of the Big Haulers various markings indicate 2020 era model.  I cannot find the usual drawings/schematics for this loco on the B-mann site.  The tender does not have room for the new components and the current mother board.  I intend to remove the motherboard and wire the Airwire G3 decoder directly to the loco.

All I need is the ID of the motor and headlight leads.  I see that there are 16 wires connecting the tender and loco, all black.  Can anyone point me to the appropriate schematic or diagram that identifies the loco/tender connections?

Steve Seidensticker