2015 & 2016 blowing trailer running light fuses

[Paintor]

Went on a camping trip with a 2015 Silverado towing a camper and a 2016 towing the boat. We hit rain and both trucks blew the 20 amp trailer running lights.

 

Think its the plug junction box on drivers side of frame right before rear bumper getting water in plugs. Is there a TSB?

 

Appears to rectify itself after a week-2 weeks of drying out on its own. Di Electric grease the plugs?

[wforrest08]

With my 15 I kept blowing the fuse when plugging in the 4 prong on my utility trailer for some reason only with this truck worked fine with the 3/4 ton. Ended up coating the crap out of the plug and the port with dielectric grease been good to go since now keep them lubed up all the time.