My brother had this problem.
Dodge ram 1500 3rd brake light leak.
Leak from 3rd brake light i have the same problem water leaked into the back seat storage and upholstery got wet.
It rained all day today and no leak.
3rd brake light gasket fix first read about it being a problem on this very informative thread.
The first dealer globed silicone around the 3rd brake light.
We re the ultimate dodge ram forum to talk about the ram 1500 2500 and 3500 including the cummins powered models.
He went to another dealer and they did a better job.
Service guy told him some trucks have the thicker one from the beginning and some do not.
Evidently the 3rd brake light gasket was initially thinner and there is a newer one with a much thicker gasket.
It is reported that on fourth generation dodge ram trucks the brake light located above the rear sliding window that leads to the truck bed otherwise known as the third brake light happens to allow water into the cabin.
Fixes 3rd brake light leaks.
Fixes 3rd brake light leaks.
This gasket is a 187 thick automotive spec epdm foam rubber gasket.
This material will not shrink or take a set like the cheap factory pvc foam gasket.
Dmt 1994 2001 dodge ram third brake light center high mounted stop light chmsl gasket.
This gasket is a 187 thick automotive spec epdm foam rubber gasket.
The factory gasket is made out of foam and water soaks right through it.
Dmt 2009 2018 dodge ram and 2019 ram classic third brake light center high mounted stop light chmsl gasket.