Outside lights

I've been doing some work on my Trailmanor to get it ready for my yearly vacation and noticed that some of the outside lights weren't working. I took the covers off and it looked like the switch wasn't making a good connection. It was the same problem on three of the outside lights. Has anyone else had this problem? The bulbs were all good. Any suggestions?

[tentcamper]

I have had to clean the light fixtures and light bulbs with contact cleaner throughout the years. Put dielectric grease on those contacts once clean to prevent future issues.

[scrubjaysnest]

I have had to replace bad switches on two of the three. You can get replacement assemblies off amazon or ebay. Any RV place should have them also.