On my Voyager monitor there are 2 connection ports on the back. Yours are probably the same. You will have to make sure the camera cable is plugged into the right port. You have to have the engine running or in gear to get the camera to work.
On the front of the monitor there are also switches for the camera ports, day / night use, contrast and brightness. They all have to line up to get the picture you want. Someone may have played with them and turned down the contrast/brightness so you get nothing.
You will have to play with them to see what you get.
Hope it helps.
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