Sounds like the circuit breaker for the headlights. It might be
overheating (worn out, bad connections or whatever) or you may have a
short and its just tripping like its supposed to. Unlike the circuit
breakers in a house, these reset themselves automatically for obvious
reasons. I'v enever had an Imperial do what you describe but a 1950
Studebaker once did it to me all night. We finally found that the
luggage in the trunk had pressed against a tail light wire causing a
short and it made the breaker keeep tripping. Your Imperial shouldn't
have any exposed wires there but there's plenty of places things in the
lighting circuits can get shorted.
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