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Starting problems after alternator replacement on a BMW X7

Hello everyone, I have a 2020 BMW X7 with a diesel engine and 157,000 km on the odometer. Recently, I had the tires changed from winter to summer tires, and since then the car won't start. The garage ran a diagnostic and found that the alternator was defective. After replacing the alternator, the car still won't start. You can hear the starter motor turning, but it stops after a few seconds. It doesn't work even with a new jump starter. Does anyone have similar experiences or suggestions as to what the problem might be?

(Translated from Dutch)

After replacing the alternator on a 2020 BMW X7, the vehicle still won't start, with the starter motor turning briefly before stopping. Possible causes include corroded or loose battery connections, which can prevent starting despite a functioning alternator and battery. Ensuring clean and tight battery connections is suggested as a potential solution.

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1 comment(s)

Check the battery connections to ensure they are clean and tight. Corroded or loose connections can prevent the car from starting even if the battery and alternator are fine. Let us know if this resolves the issue or if you need further assistance.

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BMW

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