I picked up a used set of TMCC equipped Northern Pacific f3 ABs in a lot of items and the powered unit seems dead on arrival. Engine lights up in neutral but won't go forward or reverse with a conventional transformer, I don't have TMCC or Legacy to test it. Does it sound like the E-unit is fried? or could it be something else? any help would be appreciated!
thanks
alan
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First thing I would check is see if the RUN/PRGM switch on the powered unit is set to RUN. If it's set to PRGM (Program) then you need to set it back to run. The switch should be underneath the locomotive
ah yeah good call. I'm pretty sure I did that but I'll check again. I have zero experience with tmcc! 
If it's already on RUN I would go ahead and try PGRM. If it runs normally then the switch wiring is reversed. If it still won't run either way then there's likely some other issue.
so weird, so it looks like someone disconnected the yellow leads and taped them off. where are they supposed to attach? to the motors?
see image below
according to this doc on page 38:1-3 they indeed do connect to the motors. but why would someone do this? so it intentionally wouldn't run? for display purposes maybe?
They attach to the brush that doesn't have any wire running to it. The brushes near the bottom of the picture don't have anything connected to them! 
Yup that fixed it. So bizarre
I'm guessing your guessing was correct, they wanted to demo it with sound and didn't want it taking off. 
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