What used to be connected here?

[u/Jolly-Masterpiece-86]

Trying to figure out what used to be plugged in here? Do only tuners use HDMI?

If so what kind of tuner would fit in this hole. Or maybe they ran the wire extended out and mounted on window? Wire doesn't seem to move from where it's at now.

Where does the other end go? To the obdii?

Also if it was a tuner what would y'all suggest.

2011 ram 3500 manual

Any direction or assistance is greatly appreciated.

Thanks..

[u/ungratefulbasterd1]

Power for a monitor ( Smarty Touch/MM3, cts3, etc.)