I traced it to the third brake light instead of the rear window.
2019 ram 1500 third brake light leak.
Numerous threads on this 3rd brake light leak the humidity will give bad smells in cab no good for health some reported dealer taking carpets out to wash and dry them and replace the soaked undercarpet.
Had that happen in my 12 1500 laramie.
Dmt 2009 2018 dodge ram and 2019 ram classic third brake light center high mounted stop light chmsl gasket.
I put the light assembly on as tight as was prudent and water came gushing in on my 8 year old son while we were in the carwash.
Post 2 in here see post 17 18 19 20 21.
Actually the correct part to wire in a truck bed cap s third brake light is the converter pp20 702.
This material will not shrink or take a set like the cheap factory pvc foam gasket.
Can i use this adapter to power the third brake light on a leer cap from a new 2019 ram.
Connecting 3rd brake light in leer cap to 2019 ram 1500.
I had replaced the 3rd brake light bulb a couple of weeks prior and had noticed that the foam gasket was all compressed.
Fixes 3rd brake light leaks.
It stopped the leak completely.
I removed the third brake light applied clear silicone caulk and reinstalled.
Since your 2019 ram s turn signals and brake lights.