@dawsonar802,
I am still pushing through using the OEM cable from the GM camera kit. Because you said the DIY cable used a DBV-T female connector at the receptacle and it worked "great" I thought the mating DVB-T TV male connector would be a match to the OEM camera cable end, alas it is not a match. The male DVB-T TV plug does not fit into the female cable end. They must have used a proprietary connector. Now since it seems impossible to contact the supplier of either the GM receptacle (7-pin in the box of the truck) or the camera kit I am thinking of alternatives.
I can buy a 15 ft cable assembly from Segemart with the DVB-T TV female connector (for the receptacle in the truck box) with a FAKRA A female plug that will then plug into a second GM 7 Pin receptacle which then will mate perfectly with the GM camera kit proprietary plug (made in Mexico).
All this hinges on your testimony the DVB-T tv plug works perfectly. The DVB-T TV female connector on my custom Segemart cable does plug into the male plug on the receptacle. I just can't figure out why the other male end of my custom cable won't mate smoothly with the camera kit cable. It's like there is a taper or block that prevents the plug from going all the way in.
I thought I would run this by you for your opinion.