Power Tongue Jack LED light comes on after a rain

I had this problem and research it to find the true root cause. Remove the cover and carefully inspect the circuit board mount. I found that moisture is getting in between the circuit board and it’s plastic mount. The moisture sits right at the terminals that are the on off switch connector. I cleaned it, dried it and put a thine careful bead of sealant around this plastic rim and Vaseline on the terminal to resist moisture.