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Old 09-30-2015, 02:07 PM   #1
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Headlamp collecting water

One of the headlight assemblies on my Class A has always had a little moisture inside. No big deal, I try to drive in the daytime as much as possible. Last week it was pointed out to me that the headlight bulb had burned out. I looked and there was at least 1-1/2 to 2 inches of water in the assembly. Of course it had splashed on the hot bulb, and broken it. I can find no cracks anywhere in the housing, so I am assuming that this is condensation. Additionally I can find no way for condensation to drain. Does anyone know of any reason why I couldn't drill several small drain holes in the low points of the housing before I reinstall it?
Bob
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Old 09-30-2015, 02:24 PM   #2
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Sounds like a leaking gasket, that's a lot of water to be just condensation. If you drill one small hole at the low point, that would be enough to drain any future condensation or a leaking gasket.
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Old 09-30-2015, 02:31 PM   #3
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If you can, remove the headlight assembly and drill a small hole in a low point of the area where the bulb is but on the back side to help keep more water from being forced in while driving in wet conditions. If there is enough room with the assembly installed, you don't have to remove it.

I had a '79 MBZ 300D with a leaky fog light. Removed it and drilled the little hole in the back and no more moisture collected in there and I was able to stop changing bulbs all the time.
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Old 09-30-2015, 06:20 PM   #4
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Quote:
Originally Posted by BFlinn181 View Post
Sounds like a leaking gasket, that's a lot of water to be just condensation. If you drill one small hole at the low point, that would be enough to drain any future condensation or a leaking gasket.
Yeah, I was hoping for a leaky gasket, but the thing is just one solid chance of plastic,..errr..poly something or other. Unfortunately the wiring for the headlight itself was routed in such a way that I couldn't take the unit into my shop, but i was able to drill two 1/4 in. holes, one below the headlight, and one below the running light. I drained all of the water out of the assembly as best I could, Installed new bulbs, and reinstalled the thing into the RV. Everything worked. Then I used 3M headlight polish to clean up the outside of the assembly , and Aerospace 707 to make the plastic happy.
Thanks to the responders for their ideas!
Bob
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