Some customers find that after they refit the car, the lights are no longer working properly, they are either always on or not under control, because you have not reestablished the connection after removing the connection between the light and the receiver. So we see it as an important reminder. Please read it carefully -- 

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Important Note: the black plug with 2 wires (red & black) should be plugged in at the SW position, but the negative pin must be left blank. The black plug should be oriented so that the negative pin is blank and the 2 wires are connected to + and S.
 

​This is the full page of transmitter and receiver， Please click the picture on the right side, and focus on the lower part ----》