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What needs fixing if the battery and alternator keep dying?

I have a new battery , I have a new alternator, I have a new belt - what do I fix next?

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You need to check the voltage output. Your output should be between 13 and 14 volts when car is running. You can contact a mechanic for more troubleshooting options.

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either something is staying on...for example, glove box light, trunk light,.etc, or...you have a short in the electrical system.

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Voltage regulator.

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All other answers are good but also keep in mind a new alternater doesn't mean it's any good. Many new car parts don't work. Hope you kept the receipt.

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