My camera (Power Acoustik CCD-4XS) had two power leads. One that ran with the RCA, and one that was meant to run to the backup light. I ended up only hooking up the backup light end, and that worked fine for my install.
Now, the issue could have a simpler solution. My first installation of my camera, (which is very small and symmetrical) was upside down. I found this during my testing before running the RCA though the inside of the car. With that in mind, make sure there are no obstructions or other issues..(camera backwards etc.. Hey, it happens).
Plus, you can always check the