2010 ford edge rearview camera issue

Im installing a rearview carmera and rearview mirror with a screen to view the camera in a 2010 Edge . I had everything working I thought till I started the vehicle up . If I have the engine running I loose my video from the camera . If the engine is off and the key is on it all works fine . Im assuming I have something hooked up wrong but I cant figure out what . I know the mirror is made by Advent and is model # LCDM42 . I dont know the info on the camera . The install instructions that came with it werent the best so I did my best to figure which wires needed what . I have my signal from the reverse light run right from the rear reverse light and for my main power for things I was using the WHITE/ Orange ignition wire in the factory ignition switch harness .  Any info would be great. This issue has me going nuts cause I know its something simple Im missing

I forgot to mention it only happens when the vehicle is running and I shift into reverse . If the engine is off and the key is on it works fine when I shift into reverse

Where did you ground the system ?Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA