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Use a voltmeter/multimeter to test for voltage.
Put the black lead on a grounding point on the car, and then with the low beams set to on (but don't plug in the headlight harness to the main harness) stick the red lead into all the connections and check for 13v. You can do the same on the drivers side to see which wire is the low beam by simply turning off the low beams once you find a 13v source, and if the wire goes down to 0, that's the low beams. Passenger side should be same position/wire colour.
 
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