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1987 944 Voltage reading

Electrical

Vehicle Information: Model(924/944/968): 944; Year: 1987; Body Type: Coupe; Total Mileage: 111,000;

Reading from a voltmeter across the Battery terminals is 13.96 to 14.05 with the car idling. The dash voltmeter reads about 12.3. Should the dash voltmeter read the same as the reading across the terminals? I've read that some cars electrical systems were designed so the readings should be the same.

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