For a 4-wire system, it's very simple: you take one wire on one probe, and with the other probe you touch the other wires. When there is one that goes "BBBIIIIIPPPPP!!" or the measured resistance becomes low (it depends on the motor but a wide range would be 1 to 50 ohms) you are good you have found your coil and by elimination the two remaining wires are for the other coil.
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