The rear defrost on my 08 2-dr is on the drivers side.
Yep, mine too. That's on the other side. The passenger side has the harness for the rear tail gate system, rear lights, and sub and 12v power as far as I can tell.
So you say yours came with a plug from the factory. Have any pictures you can share.
Maybe there is a knockout on mine. I'll have to have a look and see. I would like to keep it all factory but the cost of that maybe high.
I was planning on getting a weather proof outlet from Pep Boys for like 12$ and putting that in. I want to tie to the factory wiring as was shown. I bet mine has that plug too. probably for rear defrost and sub etc.
Took some pics for you
It's tough getting them to come out with a black on black jeep though so hopefully they still help.
That plug on mine ONLY goes to the sub and power outlet.
It's behind the plastic on the top right in this image.
There are three pieces that come off, top left where the belt goes through pops up. Then there is a piece behind that spring clips out.
Then the main big piece. IIRC, bolt at the top that is exposed once the back piece is removed, and then the tie down bolts at the bottom. Then it is held in place with clips on the body studs.
The OEM replacement parts that I bought were not badly priced at all and I was happy they were OEM and my rebuild looks perfectly stock.
You can probably get the wire harness you need from a breakers yard.