If you have standard sealed beams, there is a high beam filament in the low beam bulb which is switched on by the high beam relay. (The low beam relay switches off when the high beams are switched on). It's possible that both hi beam filaments are burnt out in the low beam bulbs, or there is a wiring problem. On the high beam wiring connector, there is a terminal with 2 wires coming off it. One of these wires goes to the high beam filament in the low beam bulb.
To bring you
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for your car