How to replace the electric car charger correctly?

- Jan 17, 2018-

Charger input plugs are 220V, but the output plug has a round hole shape and square two kinds, round hole-shaped plug for the positive, outside the negative, the same model can be interchangeable, square plug n for the positive, l for the negative, but the individual manufacturer of the charger n for the negative, l for the positive, even the same model of the charger, Before using the use of external table to measure the charger and battery positive and negative, polarity is in use after the match.