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Check and make sure seals are even not warped. Check for rust around the are where it's leaking. If you have a compressor with a blow gun blow along the area where the water is leaking in. If you feel air coming through the area check and make sure the weather stripping is sealing properly. Doors could be out of alignment as well causing the leak. Or door seals could be rotting out.
Believe it or not, check the rear wheel wells for rust damage or holes. As the tires spin the water is thrown up into the well and penetrates the rear cargo panel. If not try to check the saturation starting at the rear door and follow it until it gets less. The odds are the water is coming in through the wheel well.
Just fixed the same issue on our 2004 Suburban. Turned out it was just that the drain for the rear A/C was clogged with dirt (located right behind right rear tire -- above the exhaust pipe). All it took was a paperclip, straightened out, poking gently in this narrow rubber ****... and the water came gushing out (floor was wet at the time). If you do it when the floor is dry, you would have to turn on the rear A/C for a while and make sure the condensate drips out of the drain.
mcdevito75 here, It could be a number of ways water is getting in, first is there any water in the front carpet that can be flowing to the back, if the fron is also wet you have to check the A/C evaporator drain, under the dask by the glove box a rubber hose connected the the evaporator leading oustside the truck, make sure this rubber hose is attached, if only water in the rear, check the cargo bed of your truck for leakes, also inspect the rubber around the door frame of your truck.
If your only going with a flat 4 connector, you will have a connection behind rear bumper area that you can buy an adapter to put between the connectors & flat 4 will connect from there, otherwise you can splice into your light harness in back of cargo area, behind panel in the corner. That's all provided your only going with a flat 4. If you need more info, just let me know.