Yes, there are three yellow wires. Each one is equal to the other, meaning you can connect any three in any order to the regulator and the circuit will still operate normally.
So disconnect the three yellow wires from the regulator and grab your continuity test light with the battery in it. Connect the long test lead of continuity tester to engine ground and touch the test probe to the engine ground to confirm the test light is working.
Then connect the continuity tester probe to any of the three yellow wires, the continuity tester should not illuminate. If it does, it means the stator is shorted to ground.
From there, we need to use your digital voltmeter set on the lowest Ohm scale. Touching the two voltmeter probes together should produce a low reading, close to zero. Separating the two test leads should create a very high reading, perhaps "OL" or something like that will display. This means out of range, there's no higher resistance it can measure. Then connect the voltmeter probes to two of the yellow stator wires, the reading should be about 1 Ohm more than touching the probes together.
Test between all three yellow wires in any and every combination, the readings should all be around this same 1 Ohm value.