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I picked up a P2K blue box SD9 at Springfield this year, and am installing a D13SRJ in the locomotive for now.  The motor leads are black and red.  Do I assume the red is positive and black is negative, and which do I connect to the orange and which to the gray.  Edit:  I understand that it is just a CV change to correct it, but I would like to know for future reference, saves overall hobby time if I dont have to do re-work. Just a side note, wire or bottom contact on the locomotive was making contact with the frame, I got continuity between the coupler box thing and the motor wire, so I removed the piece of masking tape (saturated with some sort of lubricant?) cleaned and replaced with Kapton tape.   I also lost my wide roll of Kapton tape in the move...[banghead]
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