I spread a light film of petroleum jelly all around the inside of that
boot.... then the back of the reflector's glass surface and the rubber boot,
forms a wet grease seal, helping to keep out any moisture Condensation is a
bigger problem in colder countries while running lights longer in our darker
winters, personally I don't drive my camper in the winter unless I'm going
south.... and that itch is quite the bugger.

 >In a message dated 99-02-20 16:33:04 EST, you write:
>
><< If anyone else has installed these, how did you seal the
> back to protect it from the weather, moisature,
> condensation, etc.
> Thanks for any info.
> steve >>
>
>Steve,
>
>On the Carello H-4's that I installed there was a BIG rubber boot that
covered
>the entire bulb-socket.
>There were three slits in the back of the boot that lined-up with the three
>prongs on the back of an H-4 bulb.
>This provides a very effective weather seal.
>I know that Bosch also uses this sort of arraingement on their round H-4's.
>
>Hope this helps,
>
>Sam Bateman
>Fork Union, VA
>'87 Vanagon GL
>