h4 bulb triangle which is positive and negative

Light bulb is part of the positive and negative poles, mainly to see the lamp base (two lines of that is the iron wire, that is, the negative pole) the rest of the two are positive (far and near light).

led positive and negative can look at the long and short legs to distinguish between the long leg is positive, the short leg is negative. pcb on the general will be marked positive.

Precautions

1, for H4 bulbs, you can use a test pen, the test pen end grounded, and then turn on the low beam and high beam, so that it is very good to distinguish between the high and low beam control lines.

2, the plug face to their own, the left side of the negative pole is also playing iron, above the middle of the near light positive pole, the right side of the far light positive pole, can also be connected to the opposite, because tungsten bulbs do not have a one-way access to the role of the so the opposite direction to connect the night can be It is the left side of the positive pole, the middle of the near light negative pole, the right side of the far light negative pole.