I’ve noticed the left rear floor of my ‘05 Ram 1500 QC is wet after rain. I do not see any evidence of water leaking around the LR window or the rear glass. This happens when it’s parked sonit’s a stationary leak. The underseat storage gets damp but not wet like the cab floor.

Any suggestions where the water is coming from?

Do you think that would leak without the header or seat getting wet? If so, that'd be a quick fix!

Definitely not the brake light. It was sealed tight and no evidence of water incursion at all.

Looked at the rear sliding window. It looked like the rubber seal at the bottom left corner had a slight tear and also looked like there was evidence of leakage. I smeared some clear RTV on it to seal it up. Have to wait and see if it works.