Set the DMM to Ohms.
connect the probes to any two wires.
If there is no reading, move one probe to another wire.
If there is no reading, move the probe to the remaining wire.
Usually Red and Blue are the ends of one coil and Black and Green the other.
Polarity in such cases is
Apply Ohm's Law https://ohmslawcalculator.com/ohms-law-calculator