moisture in tail lights

the water is clear see some light signs of moisture damage inside of storage area so I put that seam tape on . sealed it but when the sun hit it the tape got soft and sagged .So I removed the tape and put silicone around it . the foam sealer from the factory actually wicked the water in to the lights. I think the idea of leaving the bottom open is a good idea. thanks to all who replied it was a great help. I think led will be next if this does not work.

If this happens to me, I will definitely get into led. I replaced the lights on the boat trailer and they are fantastic! I back into the water without unplugging, the bulbs are not hot, draw less amps and are brighter.

I don't know if I have "THE" right answer but I've also thought I've got a leak in mine.

I pulled off the entire light and can't see any water or dirt "trail" getting between the light housing and rv siding, so I called it good.

Then I took off the lens and saw where water was making its way into the light lens and then out again. But the lens screw is rusty, so some water is making its way where is not supposed to.

I put a little putty tape on where lens makes contact with actual light housing and will check in spring.

Hoping somebody replies that has really good idea.

I have the old style Barge. I wonder if the newer LED type is a sealed unit? If so that would solve my problem as far as leaking into lens.

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(Sorry, dup post)

(keep hitting wrong button, sorry)

If the water is working its way down from the roof or a window, it's likely to be pretty dirty and nasty by the time it gets to the taillights, and would presumably have caused other trouble (like delamination or punky areas). Most likely IMHO is that it's just the light fixture.

If you caulk around the light, it seems to me best to leave the bottom edge alone so that any water that does manage to get in has some slight chance of escape. Drilling a weep hole is also quite reasonable and shouldn't create any new difficulties.

If it's any consolation, I had much the same problem on a car I used to own, and solved it by drilling holes in the bottom of the lenses once I got tired of the sloshing sound when I opened the trunk. (The lights in question were mounted on the trunk lid on that car.)

I had to clean the sockets out on mine this pass spring.
I used clear silicon caulk to seal them up with new bulbs,not sure if that was a good idea.
Oh I and I put that dialectic grease in the sockets.

I have those cheap Barge? light fixtures that just don't seal well. The cases are made of cheap hard plastic and the lenses don't seal because there is no gasket. I drilled a small hole in the bottom of the lense so moisture can escape. Works for me.