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I think the low beam lamps have two filaments. So it's possible that those low beam filaments in the "low beam" lamps are burnt out. When the headlights are on dim, only the two outside bulbs burn. When the high beams are on then all four will burn.

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15y ago
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Q: Why do the high beams all 4 lights on my 66 Impala work but when I turn off the high beams the low beams 2 lights don't work?
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