How long should a new alternator last?

I jhd a new alternator fitted 18 months ago (20K miles) on my Mercedes 220 CDI and the bearings are now shot so it has to be replaced. How long is a fair life of an alternator?

Asked on 2 October 2023 by Mick Fuller

Answered by Alan Ross
The alternator bearings should not fail at that type of mileage. In fact it is rare for the bearing to fail at all. We would ask who fitted the last alternator and was it fitted correctly - if not aligned correctly or if the drive belt has been over tightened, this can cause the bearings to fail.
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