After a smooth trouble free year after my first ever carputer install I had to crack the dash open again for something relatively unrelated and decided that while I was in there I would go ahead and look into finally finishing this project. And since my free year of OnStar was up, I no longer needed to leave all the hardware intact for them. Which means I am free to utilize my factor onstar hardware. After hours of scouring the web trying to answer:
- What type of connector does my G4 GPS antenna use
- What type of connector does my onstar GPS antenna use to connect to the VIU
- What gender are the two connectors
- What is the correct power needs of the G4 GPS antenna and OnStar antenna
- What type of cable would I need
- Where in the world can I find one without spending $50
I finally came to the conclusion they both are MCX 3v (3-5v for the G4, according to the magnetic side of the antenna)
So all I needed was a short male MCX to male MCX, found these and ordered one today.

I ordered the first one for $12+shipping from
cableorganizer.com out of FL and I'll give it a shot when it comes in. For such a small order, their customer service was off the hook walking me through my best option and finding me the shortest (READ:cheapest) cable for my install. I hope it works, time will tell.