BMW E60 alternator fault and brushes
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How long do the E60's alternator brushes last?
The brushes typically last about 250,000 km, and the reported replacement intervals are about 200,000-270,000 km. The slip ring grooves wear at the same time, so the brushes and the slip ring are replaced together. The bearings can be renewed at about 350,000 km.
What is the correct charging voltage on the E60?
The charging voltage typically varies between 14 and 15 V. If an AGM battery has been coded into the car, the voltage is at most 14.6 V. Measuring the voltage quickly tells whether the alternator is charging.
What should you note when repairing the alternator?
Use bearings from a known manufacturer, because quality differences are big and with the cheapest ones the saving is only a few euros. Reconditioned Bosch alternators can be weak, and a Bosch cannot be opened without breaking it. A Valeo is easier to service yourself.
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