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A sealed beam headlight may smoke when switched on due to overheating, which can occur if there's a short circuit or if the bulb is drawing too much current. This overheating can cause the internal components of the sealed beam to break down, leading to the release of smoke. Additionally, if the glass lens is cracked or damaged, moisture can enter and cause internal failure. It's important to replace the sealed beam unit to prevent further electrical issues or fire hazards.

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1w ago

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