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Three Pronged Sealed Beam

Those seald beams which have three metal pins [prongs] have TWO filiments inside; one for the low beam filiment and one for the high beam filiment. The third [center] pin serves as the ground for both filiments.

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βˆ™ 15y ago
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Q: Why are there three prongs on some sealed beam headlights?
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If your bright high beam headlight on driver's side doesn't work but the low beam does do you still need to replace bulb?

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