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Typically if both the battery and brake warning lights are on it means your alternator is not producing a proper amount of voltage for continuous charging to your battery. The proper way to find this out would be to apply a meter tester to your battery and run your vehicle at idle. The meter should be set on a voltage setting between 12~16v DC. On idle the alternator should produce at minimum 14.2 volts. If it is not, then therein lies your problem. 99% of the time owners will replace the battery first, but in most cases it is not necessary. Only if you have driven the vehicle continuously while alternator is failing will it become necessary to also replace the battery, as it will end up burning up the battery from continuous draining and recharging.

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