For a 4-wire motor it's very simple: you take a wire on a probe, and with the other probe you touch the other wires. The one for which the meter does "BBBIIIIIPPPPP !!!" or for which 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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