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Just wondering if this is an original dimmer switch for my 1972 Imperial? I've never seen a dimmer switch like this one. The three connections on the front I understand - but the lone one on the backside is what I have no idea what it's for? Can someone explain how this is supposed to...

Just got back home in Wisconsin after picking up a 1972 Imperial out of Alabama (950 miles one way). Will helped me with the purchase of this car - Thanks again Will for helping me out with this - I certainly appreciate it. Lots of nice options I was looking for on this car. I really like the...