Tab 320S: Wet spots inside of the Tab.

californication

When I was recently working on wiring on my Tab, I noticed wet spots inside of the Tab. It's located around the Nautilus, on the driver's side. I'm suspecting that there might be something wrong with how the Nautilus is installed. Does anyone have the same issue?

rfuss928

In my UT the Nautilus hose port is right behind the left tire and allows wet weather tire spray to enter the box which is not sealed from the trailer interior.  A foam plug placed in the hose port below the snap cover solved a similar issue in my case.  Additional sealant between the Nautilus box and trailer outside wall is an additional preventative measure.

Basil48192

I have a 2021 320S and noticed, right after I bought it, that water was accumulating inside the camper in that same area.  I determined that it was coming in from the Nautilus compartment after connecting and disconnecting the hose.
It was leaking in from the openings for the low point drains (circled in the photo below).  I squeezed some clear, silicon caulk into the corners and around each pipe.  You can't really get to the bottom of the pipes, so I forced it into the area with my finger to the extent possible.  It's not very pretty, but it worked really well.  
I am also very careful when I use the compartment, making sure to wipe up any overflow and keep the area as dry as possible.  
Hope this helps!

californication

Thanks.
I'll take a close look for possible leak spots.

BillJ70

Also, mine was leaking from the corners closest to you in that compartment.  There was no caulk in those area and it was letting water through.  I had to use my cellphone and point it backwards to see it. This is facing the outside of the camper (in the Nautilus box).  It was like this on both sides-- water was coming into the camper and out from some seams underneath.  I saw another post yesterday (different subject) where someone described this same issue. 
  

californication

@BillJ70 you were right. There was cracked silicone in the corner.
I was filling up fresh water tank today and I could take a closer look on it.

I removed the old caulk and I patched it with a fresh silicone layer. I hope that's gonna address the problem.

BillJ70

Good to hear, @californication.  Hopefully that solves the issue.  We were on an incline filling the tank when we noticed the leak initially (and I was a little sloppy with my connection).  The incline caused the water to pool back there in the corner- and then into the camper and out the bottom.  It seems odd to have a pan there that relies on caulk to keep water out- especially in a place that's almost impossible to see.  And I see you have a screw there too.  I guess that area is just another item for the maintenance checklist!

californication

Yup, I was terrified to find out this "setup". I'm not even sure why there are these openings in the first place.

I'm not sure if I was unlucky with my trailer, but I'm finding more quirks more often than I'd like it.