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Testing an instrument across the car battery

Connect one side of a circuit tester to the battery earth terminal. With the instrument removed from the car, tough one of its terminals to the other battery terminal. Connect the tester to the other instrument terminal. The lamp should light and the instrument needle should register. If there is no light or no movement, the instrument is faulty.

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Checking the instruments

A car usually has up to six main instruments — speedometer and tachometer (rev counter); fuel, o...