I believe that these are in parallel.

Phase -> Stepper wires
(Phase A) red -> blue + yellow
(Phase B) white -> Red + white
(Phase C) green -> Green + brownish-beige
(Phase D) black -> black + orange


Coils are 
Blue + red = 1.6ohms
beige + black = 1.6ohms
orange + green = 1.6ohms
yellow white = 1.6ohms