I install the HID for my fogs on 2010 g37s. I didn't put the cover back on because the wires are in the way. Will this cause condensation inside my headlights?

 

Yes possibly. Or worse, if you get small bugs and what not trapped in there. Drill some holes and feed the wires through the cap then close them.
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Danny, go away with your M3. Just kidding I <3 you =P.



OP: Yes it can build up condensation inside.

 

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Although some don't recommend cutting the bulbs wiring but so far I never had any problems with it at all! So as the other sets I've installed on friends car. Same method used.

 

moisture in the lens is always bad.

 

Thx guys! I never has moisture ever since last summer, but I just got it like 1 week ago after I washed my car. I mean does the cap really matter? since when you put the bulbs in, they cover up the hole already so I don't see how that happened.

 

Just because you think its covered doesn't mean water molecule can't fit through. chemistry 101? :P

 

So are you saying that its normal to have moisture inside every now and then?

 

not enough that should condense