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Vehicle Information: Model (914/4, 914/6): 914/4; Year: 1976; Engine (type, size, modifications): 2.0, Previous owner enlarged pistons/camshaft; Total Mileage: 85000;

I just purchased this car and on the day of purchase I installed a new battery because the old one was 5 years old. My voltmeter reads over 12 volts when driving during during the day, however, as soon as I put on the headlights, the voltmeter drops below 12 volts. Is this normal? Possible causes? Am I discharging my battery if I drive for prolonged periods at night? Can my electrical system handle a lighting upgrade? Thanks.

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