what to do about water in marker lights?

the best seal I have found to put on the top of the runnin lights is alumn. duct tape from Lowes ,,its really good to seal just abt anything,,just be sure you get the type with a thin layer of byutal tape on it it will last for years in the hot sun of FL and the rain dont hurt it..very good idea to keep a roll in the camper ..

I've cleaned mine and then put a strip of electricians tape across the top seal.

Seal the top and sides (not the bottom) of all marker lights. Either replace or drill a weep hole in the problem one.

I always repair or replace mine if I find water in them. Some have WEEP HOLES and was installed in the wrong direction. Some have dried up sealent applied.

Letting water stay inside the marker lights will eventually cause damage to the light assembly or the wiring and may drip water inside the trailer coming through the walls where the wiring is installed.

One extreme situation I had was the large 8-inch scare light lens was installed wrong and the weep hole was on the top. It had filled up with water up to where the wiring went through the trailer wall to inside the trailer. I had water dripping inside a ceiling mounted cabinet and desk top below it. Scratched my head for a bit as to why it was half filed up with water and the identical one on the other side of the trailer didn't. That is when I noticed the weep was at the top of the fixture instead of the bottom. Lucky I didn't get any sustained water damage on the inside of the trailer.

Roy Ken

$5 at Napa, easy to replace.