Thanks S-Ohana -- yeah, actually I looked there also. Odd problem because each of the 3 5 pin dins simply can't be run into a single RC jack because each video line and triggers are separated.
That Magnadyne is NOT a good radio. Features available are nice, but man, it is problematic functionally. I think the "telephone in" signal could have been the telephone mute wire on the back shorting against the case of the radio. Not sure.
Anyhow...
All of the connections for each of the magnadyne cameras are under the drivers side kick plate under the steering wheel -- all 5 pin din connections (green Rear, white left and gray right) are there.
So, I am getting close. I have the radio and the video capabilities wired and running.
Next, I found that the 5pin-din to RCA Connectors (HAR-RCA-C)on Magnadyne's website:
https://www.magnadyne.com/catalog/pa...3490&CID=26097
I do have each working independently when I set up a straight +12V trigger separately to each camera.
Then what I found is a video mux with 3 inputs on Amazon.
Amazon.com : Intelligent Car Video Switcher 3-way Input 1-way Output for the Car Camera : Vehicle Backup Cameras : Car Electronics
Now, what I am trying to do is wire each side camera trigger to each turn signal switch for +12V (before the pulsing relay) and the reverse to the reverse wire from the ford wiring harness and let the mux do the video switch to one output for me.
In theory.. it should work
I will update the post and put a drawing of the connection if I get it working.
Thanks for the reply.