You have to remove the camera of course. Kaymar instructions say to just remove from here. Those plastic inserts for the screws that hold it in are very difficult to remove - or they were for me. I ended up removing the panels from the rear hatch to gain access from behind. I was also installing a cruiser outfitters rear hatch release / handle so you can exit from the hatch when sleeping in the vehicle - so I had to remove the hatch panels anyway. You'll reuse those plastic clips to reattach the black cover plate that comes in the kit. I use a few butyl strips on the cover plate in efforts to weatherproof it. The factory camera mount had gasketing, the cover plate does not.
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This is the plug just under the headliner you need to disconnect. You will need to pull back the upper and lower cargo panels to be able to access this area. First you'll need to remove the tailgate cover/flap trim piece on the floor. I just popped the first set of clips along the egde of the cargo opening and propped the panels open while I worked in there.
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Then connect the Kaymar harness into the end secured up in the headliner and the other connector onto the factory one you disconnected. Route the loom down the rear corner.
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You'll need to drill a hole in the floor for this grommet. The corrugated wire in the photo is the Kaymar loom. I think the hole diameter is about 1 1/8". It was much easier for me to drill from below with an extension on my drill. I was also installing my radio antenna and fished the wire through that same grommet, that is the additional wire you see in the pic.
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Installation of the wiring and camera were easy, it was just all the panel removal and drilling the hole, etc that was time consuming.