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First check whether or not that is happening with the car in motion or at rest.

Intermittent lights in motion indicates vibration problem affecting light switch, fusible link, or wiring - including grounding.

In addition to the above, intermittent lights when stationary could result from intermittent alternator output of battery output.

You did not give vehicle model, but intermittent sealed beam halogen lights on older car models can result from hole hole/chip in a headlight lamp that breaks the vacuum inside the lamp. If encountering repetitive low battery charge, that is an indicator of defective sealed beam headlight lamp.

Defects in automatic headlight systems in recent models are best checked only by qualified service personnel.

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Q: When head lights keep going off and on what do you check?
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