I haven't done this yet since it is too cold still.
The most common way that I have read is to use the plastic plug that for the clutch on manual transmission JL's. I have not been successful figuring this out yet.
My second though was to remove the small panel in the bottom driver side corner of the windshield and see if there is easier access there. I have not looked yet.
I have already installed the Mopar wiring harness.
David
2012 Fleetwood Discovery 40G
2012 Jeep Wrangler Unlimited
2019 Jeep Wrangler Unlimited