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Sep 12,  · What voltage does a car amp need? Car amps normally work off of a range of voltages, not just 12 volts, although that’s used as a general reference. In fact, as a vehicle’s engine runs the alternator charges the battery and the .

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A faulty alternator would drain your battery quickly. Instead of you using the battery to run your car, the bad alternator would drain it. So, when you replace the batteries, you have to check your alternator as well. 3. Dimming Headlights/Lights. Another symptom of a bad alternator is the dimming or flickering of your vehicle’s headlights.