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Check Positive Cable Connection and Battery Terminal

Model: BMW Serie 3 E46 - Years 1998-2006
Part: Checks and maintenance

If the battery suddenly discharges enough to prevent engine starting, there is likely an issue with the charging system: you might initially think the problem lies with the alternator, but it is often found that the defect is in the connection between the cable and the positive terminal on the battery. To check, measure the output voltage from the alternator (which should be correct) and then measure the voltage at both sides of the terminal; you will notice that the voltage before the terminal is 14 volts while at the battery post it is just over 10. Therefore, loosen the terminal, remove the plastic cover, and securely fit the cable head into the terminal slot.

Updated on 20 February 2026 by ScegliAuto

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