Find the common centre tap with a multimeter and apply +12V to it. Now take any other wire and ground it, call this #2, now pick another wire and ground it as well, if the motor moves clockwise label it #3, if counter-clockwise label it #1. If it does not move label it #4 (or the motor is knackered). Remove the newly labeled wire from ground, still leave the other two connected (+12 & #2)
Pick another unlabeled wire and repeat the above steps untill all wires are labeled.
The wire numbers are not important, it's the sequence that is.
Hope this helps. |