How to judge the front and back of led motorcycle headlights

LED motorcycle headlights have two sides of the light, but also three sides of the light, both sides of the light, when the low light is bright on one side, the high light is full on both sides. When dipped, only one side is bright, and the side is facing up. In other words, you can set the low beam switch on regardless of the front and back. If only one side is on, it means the wiring is connected. If the side on which the side is on is up, congratulations. , But if the bright side is facing down, it means that it is reversed.
If you turn on the dipped beam switch and find that both sides are on, it means that the wrong wire is connected, and another wire is enough.
In addition, there are three sides that emit light. The three sides that emit light are bright on both sides in the low beam, and the three sides are all bright in the high beam. The method is the same as above.
But there is another way to look at the color of the line. Take the most popular "three-sided LED headlight M3H" as an example. The green line of the headlight is connected to the negative line of the original car, the blue line of the headlight is connected to the long light of the original car, and the white line of the headlight is connected to the near light of the original car. If the cable is connected incorrectly, the headlights will not turn on, but they will not burn. Most of the LED motorcycle headlights are protected by the positive and negative poles. They can be connected at random, and they can be tried until they are on.