I missed the "affecting the fuses" part... if that then the leak is
probably at windshield lower corner.
I had this problem due to a bad windshield replacement job (with new seal).
I fixed it by a thin paint scrapper and lift the lip of the seal, squeeze
int some clear silicone window caulking around the corner, few inches at a
time about 5 to 6 inches vertical and horizontal then clean up the residue.

On Sat, Jan 4, 2020 at 11:28 AM Erin Daniels <eirejammer@gmail.com> wrote:

> Anyone else have a really bad leak on the drivers side floor when it rains
> a lot? I cannot tell how the rain is getting in, it’s a huge problem. I
> fear I’m being overcome with mold, etc. I think it’s also affecting the
> fuses. I’m referring to an ‘85 Vanagon tin top.