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This kit does not include a blue trailer wire that goes to the driver inside for the controller? Does this new kit alleviate the need to run a blue wire? And if so, the plug needed for the brake controller is found under the dash even for jeeps without factory tow wiring package?
No, this kit does not alleviate the need to run a manual blue wire if you are installing an aftermarket trailer brake controller.

The Blue Wire: The Mopar 7-way and 4-way harness kit (82216359AA) integrates lighting and power functions at the rear bumper via a specialized module and harness, but it does not include a pre-run brake output (blue) wire leading up to the dash for a traditional hardwired proportional brake controller. If you are towing a trailer equipped with electric brakes, you will still need to run a dedicated blue wire from the rear plug forward to the driver's compartment.

Under-Dash Plug: For Jeep Wranglers that did not come with the factory Trailer Tow / Heavy Duty Electrical Group package, the plug/connector for a trailer brake controller is not pre-wired under the dash. Jeeps built without the factory tow package lack the under-dash plug and the main feed wiring, which is why aftermarket installations typically require running a standalone line or utilizing a wireless brake controller to bypass the need for running physical wires through the firewall.
Can you tell me if my 2019 JL Unlimited with Rear LED lighting will have to be flashed before the trailer wiring harness will work?
No, your 2019 Jeep Wrangler JL Unlimited with factory LED lighting does not require a dealer flash (reprogramming) to use the Mopar 82216359AA Hitch Receiver Wiring Harness.
Does this wiring harness fit a 2024 Wrangler 4xe High Altitude as I was told I had to buy a special harness that would be compatible to my Jeep because of the LED lights and the 4xe?
The Mopar Trailer Tow Wiring Kit does fit the 2024 Wrangler 4xe High Altitude.
I have the rugged ridge hitch receiver. Will this Mopar harness still work with this receiver hitch or does it require a Mopar hitch?
The hitch wiring harness will work regardless of what brand hitch you have on the vehicle.
To confirm, does this harness run under the vehicle or through the vehicle? I don't really want to take apart the interior to install this even though that'd protect the wiring more. Thanks.
Most routing technique is under the Jeep. Thanks for your inquiry.
Just want to confirm that this is plug-and-play on a 22 JL sport. No Dealer Flash required after DIY install. Correct?
Dealer flash is not required. Thanks for your inquiry.
I installed this on my 2022 Wrangler Sahara. Will it require a flash? I have LED lights if that makes a difference.
Flash programming is not required for your trim level based on factory equipped lighting. Thanks for your inquiry.
Since the Mopar receiver hitch wiring harness will not fit the 4xe, is there one that will work for it? Looking for the 7 and 4 pin connector type and a receiver hitch as well. Thanks in advance for the help.
At this time, a 7 way harness trailer wiring kit does not appear to be offered for 4xe models. Sorry for the inconvenience.
I have a 2020 JLU sport, with no tow package ( I installed the hitch already) will this fit and function on this jeep, with out dealer programming? Basically- purchase, install, tow?
Dealership support is not required for programming after the installing of the wiring harness. You will be ready to tow. Thanks for your inquiry.
I have a 2021 Wrangler Unlimited 4xe Sahara with Advanced Safety Group features. It did not come with factory tow package. First, is this the correct harness? Second, will i get the trailer specific blind spot warning features (vehicle determines blind spot extension required to cover the trailer as well as the jeep)?
This is not applicable for 4xe models. Sorry for the inconvenience. Thanks for your question.