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You will need a digital voltmeter. Set the voltmeter to 20 volts DC. Check it with the probes. 1. 12.68 Volts = 100% Charge2. 12.45 Volts = 75% 3. 12.24 Volts = 50%4. 12.06 Volts = 25%5. 11.89 Volts...

You can also put the digital volt meter across the positive and negative terminals of the battery, while the car is running. The reading should be no less than 12.5 volts dc, and no higher than 15 volts. If it higher than 15 volts the regulator is overcharging your battery, and it will boil the fluid in the battery.

Some regulators are on the chassis of the vehicle, most are built into the brush assembly of the alternator. Either change the alternator or consult your nearest auto shop for a new brush set and regulator.

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Q: How do you test the regulator is well charge the battery?
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