Worked on the driver's side rear stop lamp assembly. Two people told me it was not working, but of course it always worked fine in the driveway. Anyway, took it apart and cleaned up the ground connection to body sheet metal along with the two contacts at the bottom of the lamp socket.
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10MM hex head on the ground screw, small flat blade to scrape the base contacts. There was a lot more corrosion that I expected, and I hope this fixes the intermittent failure.
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The wasps thought the truck was a very sweet hideout also. They are always finding places to nest during the summer.
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All of these were up inside the body layers above the rear lamp assembly. Now I will have to take apart the passenger side and clean it out also.