Starting with the 1967 model year the feds required the brake lights to come on no matter what position the key was in. Up to, and, including 1966 the brake lights, on most GM cars, only came on with the key in the ACC or run position. The brake lights on my 65 do not come on when the key is off. Only in ACC or run. I would say that the brake lights on your 66 are acting normally.Hope this helps.
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