I haven't cut the wire ties to absolutely trace the wires, but I think they are all purple. Only the rear lights connect to a set of pads on the rear of the engine. I put the shell back on once without screws and the fronts were on and flickering. When I pushed the rear of the shell down the springs made contact and then the flickering rear lights came on. I will try both resets tomorrow. Thanks to all.
John
Did a Feature Reset; no difference. Did a Factory Reset; no help. After adding engine back in remote, I was resetting different sounds and controls that were back to default. In the Control menu I came across ditch lights, which this engine does not have. Turned them off and NB lights wouldn't work with the soft key. Turned ditch lights back on. NB lights now came back on with no more flickering. Go figure. Thanks for all who responded and Merry Christmas to all!
John
OK, that's weird! 
Normally, the number boards are separate on a diesel. Front are paired on MARS 1 and Rear on MARS 2 as an example. Or Ditch 1 or 2 if the model doesn't have Ditch lights.
Yes you could measure at the pin but again it is easy to short with a probe at that point. Plus the Pulsed DC won't tell you much.
Lets step back, is this flashing like ditch light oscillation? If you go to menu, control. ditch lights, you have options to turn on and off, auto, flashing. Do these buttons effect the number boards?
Maybe someone used a different sound file and the output is effected. This is only if the number boards are flashing. If it is just a slight flickering, something else is the issue. This is a 3V engine, so this behavior is abnormal. G
Well, I posted that 3 days ago! It is interesting, normally the sound file over rides the Control feature of Ditch lights after then next start up. You may want to reload the sound file if it acts up again. G
It was never what I would call flashing or oscillating. There was nothing regular at all. But, I should have tried your suggestion. I'll pay more attention next time. Thanks again.
John
John, Glad it is resolved. G
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