I installed three DVR cameras to the DVR. In the day time it works perfectly fine, but the night time it is totally dark. It has night vision?

I installed three DVR cameras to the DVR. In the day time it works perfectly fine, but the night time it is totally dark.

When I look at the DVR, the camera’s are pitch black at night time. But it has night vision.
It still records because I could see the lines for motion detection that activated it.

There is not enough power going to the all three cameras. I has the same problem as yours.
I just installed their own power supply to each.
I noticed that the cameras have night vision after I installed it’s own power.

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