My cab marker lights are like little bullets. They are supposed to snap in tightly with a rubber gasket to seal them. They were the last thing I inspected to find source of water intrusion that appeared under the drivers window. 2 of the lights simply fell out in my hands. I put them back in with plenty of goop. No more leak. Seems water was coming in and running down the wiring to the light switch where it then ran underneath the wall paper and created a bubble.
Like I’ve said for 35 years, if you own an RV, you’ve gotta be pretty handy as well.
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