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High Beam Lever

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The floor hi-low switches were virtually indestructible, so the car manufacturers got rid of them. I think the only problem was with manual transmissions where you couldn't press the clutch and the dimmer switch at the same time. However, I can't recall ever having to make that choice.
 
They got crudded up with road salt and got sticky (personal experience - showing my age here). They dropped them because the Japanese started doing steering wheel stalks and the customers preferred them, so everyone switched.

Okay, I never had any problem with them (and some of the cars were pretty old by the time I got them). I do recall the advertising about how the stalk mounted ones were much better.