Are yours the teardrop?
Post 10 in this thread...
.Ours would fill right up in a good downpour. Lower street-side rear especially. (roof drains right over it). Most of the others will get condensation but will usually evaporate in the sun.
I did notice on two of the lens' what appeared to a drain cut-out in the small end bottom edge of the teardrop. Have no idea why just two
. Water was running around the base and entering there. I closed it with epoxy and filed it smooth, so far so good.
If it works I'll do the others in the Spring.