1993 grand marquis while driving the head lights goes off and on

While driving at night my headlights will go off and on after the car has been running for a while (they flicker then comes back on ,and sometimes they go off for a couple of seconds then comes back on

Check your connections at the headlights especially if they are sealed beams with the three way connecter sometimes they will get corrosion, or dirt and not get the propper contact vibrations from driving will cause them to lose contact.

next check your headlight relay it could be going bad and not pulling the internal switchinside of it to close.

hope this helps.

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