Quote: Originally Posted by
midiwall 
You'll want to find a ground within the radio itself. Do NOT try to ground the radio to the car. The purpose of "grounding" here is to extend the ground plane of the receiver, not to provide an additional electrical path for DC voltage.
That said, I suspect that the case of the USB connector on the board is a ground point within the radio.
fwiw... Where did you find a Moto pigtail socket? Got a part number?
Ok, thanks!
The motorola connector I have is an adapter for an aftermarker head unit to connect to the stock antenna. I have the male end, not the female end, if that's what you're talking about.