Back up camera problems

[damon69]

I am trouble installing the backup camera to my aftermarket radio from China. I am currently using a relay switch. Here is the problem I am having:

1. When the reverse trigger wire from the back of the radio is connected to 12v power, the monitor screen is blank. The signal is being picked up, but the there is no picture. Also, when the reverse trigger wire is connected to 12v and the gear is moved to reverse, the camera is working properly. The monitor automatically switches to the picture of the rear of the car. Terminator xxx5 has been helping me out. I am just trying to get more feedback.