Thanks All!
Yes, I can confirm all the guidance on the relay is absolutely ON TARGET
for our E53 lighting circuits.
I connected a relay today which used the reverse light positive in the wiring harness as the positive side of the relay activation (#86 in the below relay diagram).
Then I connected camera positive power IN to the LOAD side of the relay (#30 in the below relay image)
#85 of the relay goes to ground point and I placed the ground wire for the camera IN power on this tab as well (since I had already run the positive in power up to #86 of the relay, the negative was right there so I piggybacked off the #85 tab which goes to ground.
#87 of the relay went to a clean unregulated ACC power source nearby which for me was the purple with white stripe wire going into one of the connectors just forward of where the amplifier lives.
Upon completion, of relay integration, image is rock solid during engine running with absolutely NO interference lines.
Problem solved.
Thanks to everyone for their insight and guidance.
Edit: made another feature discovery today on the GA6166, apparently when you press the right side "Tune" button in, the unit screen will go to the Settings function.
Also discovered that you cannot move any app you choose to the lower screen app section, only selected apps (I believe the OS resident ones maybe) can reside there.
Mike