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H4 plug structure, three pins ground, high beam and low beam

Nanjing Huiguang Lighting Co.,Ltd | Updated: Apr 18, 2018

This article is about H4 Plug Structure, there are three pins in the plug. One is ground(negative pole), the rest two are low beam and high beam.

H4 is a very common plug in led headlight bulbs, it widely used in economic cars and autos.

If you have any need for H4 led headlight bulb, please click here