A lot of tail light fixtures, red/amber clearance light fixtures are made with a small vent hole at the back edge of the cover. The small hole is only on one edge. A lot of these covers are put on upside down at the factory, this leaves the vent hole at the top and this will allow rain to come in. Check ALL of your covers on your RV, 5-er, and TT's. Most of these can be corrected by removing the cover, turning it over and re-installing. Mike is correct in that using silicone along the top and both sides will deter water from entering.
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