Condensation in Caravan Lights

JohnM20
JohnM20 Forum Participant Posts: 1,416
1000 Comments
edited June 2020 in Caravans #1

Has anyone else experienced what I think must be condensation in their rear caravan lights? I keep getting it but only in the light cluster that gets some direct sunshine where the caravan is parked. I take the lights off and thoroughly dry them out but withing only a few weeks there is water in them again. The rubber O ring seal is intact and I have even put a piece of tape around the join between the outer lens and the rear part of the light. This has made no difference whatsoever. If, after drying all three lights out individually, it rains or I wash the caravan there is no obvious water ingress. 

In truth, the water, which can be up to half an eggcup full in each light, doesn't seem to be causing any damage to the light fitting. It's just baffling me how it is getting in to an apparently sealed unit.

Comments

  • cyberyacht
    cyberyacht Forum Participant Posts: 10,218
    1000 Comments
    edited June 2020 #2

    A very small hole drilled in the bottom of the lens will prevent a buildup of moisture.

  • Tigi
    Tigi Forum Participant Posts: 1,038
    500 Comments
    edited June 2020 #3

    Very common occurrence but never found it to be a problem,  it also occurs in many car headlights my own Volvo handbook says it is normal and will clear.

  • Phishing
    Phishing Forum Participant Posts: 597
    500 Comments
    edited June 2020 #4

    The light gets hot, the air inside expands and blows by the seal. The light cools and sucks in air from outside. The cool air has moisture in it, it condenses on the inside of the light. Repeat every day and you have a puddle in no time. 

    You either totally seal them which is virtually impossible with external units built to caravan quality, or you do what Cyber suggests although I would put the holes in the lowest part of the lamp molding to let them drain and breathe. 

  • JohnM20
    JohnM20 Forum Participant Posts: 1,416
    1000 Comments
    edited June 2020 #5

    Thanks for your replies. Phishing's explanation makes sense especially as it is only one light cluster that is exposed to direct sunlight and therefore can get hot and exhibits the condensation. The idea of a small hole is also a good idea. I'd actually done a similar thing for the rubber cover on my 13 pin socket on the car. Another little job to do before we eventually get away late July.

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