Headlight collecting moisture

My sons 2005 Tacoma DS headlight was almost half full of water so I removed the headlight, drained it and looked for anywhere that might leak. Couldn't really tell so I put silicone all the way around the seam. After re-installing, I took it for a drive of maybe 10 minutes max and the inside is already fogging up and collecting moisture again. While using a blow dryer to help remove the moisture I also covered one hole to see if I could feel for air leaking around the seam but couldn't. Where in the world is the moisture coming from?

 

Maybe the water is migrating down the wire and entering where the bulb is.

 

It looks like the inside of the lens is fogging and then it condenses on the bottom until water accumulates. I wasn't driving 10 minutes and the inside fogged up. Granted it is humid here but no way this should have happened so quickly.

 

Look into the BLHM. It requires baking your headlights and separating the lense. You could do this and totally reseal this, then check the bulb seals. That should fix it.

 

Spitdog is right, typically if the rear seal where the bulb sits is cut, damaged, altered or missing, then a lot of water can get in through there, and it sounds like you have a lot of water getting into the headlight.
If not then the seam may not be sealed correctly. You said you resealed the top, and thats where most people assume the problem is. but try resealing the bottom, because its very easy for water to get in the bottom as well. If these are aftermarket, prefabricated headlights like the spyder brand, then this is a common problem.
Personally I would pull the headlight apart, let it completely dry out and use some rubber butyl and completely reseal the entire seam, then put it back together and that should solve the problem

 

I would drill a small hole in the bottom of lens... To let water drain out.

It has worked before.

 

I put silicone all the way around the seem. But I drove it for 10 minutes and the inside fogged up. It wasn't raining, the streets weren't wet, it is humid though.

 

What about the back side then? Where the bulb goes, is it covered? And if not maybe trying wrapping it up well with some electrical tape and see if that helps
Because if its fogging up that fast, it makes me think that there is a large hole for the moisture to enter through

 

It has the big rubber boot that fits very snug and I couldn't find a crack or anything.

 

I still think you should pull them apart, let them dry and reseal. You can get the sealant from theretrofitsource.com and you can even get some silica packets from there to toss in there.

 

Have you turned the headlights 'ON' to provide heat inside?

15 minutes should clear the foggy...

Is the finish outside the lens cloudy?
Most 2005's-2009's are Hazey exterior.

 

No but my son has it now. The finish was cloudy but I cleaned them up today.

 

Lol, blinker fluid

 

I have had this happen on my Sienna van and my 10 Prerunner. You are on the right track sealing it with silicon, but you also need to get the inside dried out. What is probably happening is when you turned the light on, the heat evaporated the moisture left inside the housing, which then condensed on the lens, since it could not escape.

I removed the headlight and one of the other lights (turn signal or side light, depending on where I saw the most condensation), then put the shop vac on (sucking to hold it in place) over the hole where the headlight goes and let it run for a while (5-10 minutes). Works best if you do this out in the sun to help evaporate any water left inside.

 

This is exactly why it fogged back up so soon. Even though the water was drained, there is still moisture in the housing that is condensing. This will happen until the housing is dried out.

 

I used a blow dryer, on hot, on it for 10-15 minutes and also left it to sit out in the sun for about an hour. But yes, there could have been some water left in. I looked at it this morning and it's not as bad now compared to last night.