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1972 Chevrolet Corvette signals stopped working

1972 corvette signals stopped working. Last year I found oxidized contact in the switch. cleaned THEM WAS WORKING FINe UNTIL RECENTLY.Anyway toprevent this from happening in the future?

At this point I would replace the switch, it worked for forty years, a new one should work another forty years,

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Keep the car in a climate controlled room with low humidity.

That was done less then 10 years ago. Do you think dielectric grease would work?

It may very well help.