Kind of hit a dead end at this point.
So far I ...
1. Double checked the plug to see if it was properly grounded. It appears as though it is.
2. I lifted out the TIPM to see for sure if it was connected. It's not. At least not on my Jeep. I do see online that for some people it is connected. I have not been able to figure out why some people have it connected and others don't. But if you are lucky enough to have it connected then you are GTG. I, unfortunately, am not.
3. I examined the bundle of wires that goes to that block of the TIPM to see if the wire in question was folded up inside the bundle ready to be connected. It isn't there. My theory being that since the plug is back there, if a person goes to a dealer and wants a subwoofer installed, the dealer/tech/mechanic could just connect it. But the wire was not in the bundle. At least not at the top of the bundle.
So at this point I have only one thing left to do. Obviously the wire starts at the plug in the rear and goes forward and stops somewhere. The question is where and why. So I have to follow the wire up to the front and see where that is. My guess is that it stops at the wiring block under the dash on the passenger side. It would make little sense to stop anywhere else. There is a rather large wiring block by the feet of the passenger side that has a large bundle that eventually wraps up and goes through the firewall to the TIPM. My guess is that the wire goes to that block and then is supposed to have another wire coming out of the other side of that block and going to the TIPM fuse M7.
When I get a chance I am going to test that theory and see if it's there. The hard part is just finding out where it ends. Once I find that connecting it will be a piece of cake. My guess is that a Jeep mechanic/tech knows where this is already because, as I said, if he has to install a sub in a customers car he has to know where to connect the wire to. So the info is there. Maybe I'll get lucky and before I do all this one of them will post and let us all know where the wire is which would make it a whole lot easier.
Of course some will say why do this? Just run a new wire! Well yeah, obviously I know that. I am doing it because the wire and factory plug are already there. It's designed from the factory to work this way and I kinda like that. I like solving puzzles. I have the time. It's fun. And if I figure it out a lot of others who read this will be able to easily connect theirs.