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This is the back side of a rotary fog light switch. (Sorry it's blurred) It has three wire terminals: the upper right terminal say "Fog"; the upper left says "Bat." The bottom terminal has "T.L." I can't figure what the "T.L." stands for. You can see where the fuse goes. (removed) Thanks for the help....I'm like a deer in headlights (foglights?) when it comes to electrics.
I wrote to the manufacturer who is still in business about this old switch of thiers....but they didn't want to help!