69 Charger Ignition switch ground

[M5Ivan]

I'm changing out my ignition switch because the key needs to be jiggled a little bit to move it and I'm having intermittent starting issues (not sure if it's related)
When I pulled out the old switch, the harness that attaches to it doesn't have a ground wire connected. The slot for it is empty as pictured.
Does anyone know if this should be connected to a ground and where?
Thanks for any input!

[M5Ivan]

I found the wiring diagram and it looks like it doesn't have a wire going to it. Strange! 

[John_Kunkel]

I believe the ground terminal provides a ground when the switch is in the Start position...used for testing warning lights. The switch body itself is grounded through the dash.

[kokxville]

The housing from the ignitionswitch is the ground and it makes contact thru the dash frame.

[Nacho-RT74]

ign switch system doesn't need ground anyway. It could be even a full plastic assembly totally isolatted from frame or even that same switch hanging around from harness down the dash and will work the same... as John stated, mostly sure could provides ground ( can tell if switched or not ) for anything, but not needed on our cars... time to test by yourself if you are courious, but definitelly our cars and ignition system doesn't need that to work

[cvf]

Well, I seem to have the same problem, was there any solving?

cheers, Chris