Hmm that is really helpful.
I sort of figured out the wiring... this is what I found:
Brake lights :
JK's Purple/White (+) = Running Light Power
JK's Black (-) = Ground
JK's Yellow/White (+) = Turn Signal/Brake Power
Reverse lights :
JK's Green/White (+) = Reverse Power
JK's Black (-) = Ground
Top pigtail-
White- ground
Red- reverse ---> green/white
Bottom pigtail-
White- ground
Red- stop/turn --- yellow/white
Black- tail light --- purple / white
However, it doesn't explain the resistor.
I grabbed a photo of the PS wiring harness... seems like it wouldn't be quite plug and play for the Maxxima lights because while it does have 1 3 plug connector that would be plug and play, the other one turns into 2 connectors which won't match the other 3 plug..
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