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The battery in my Ford Mondeo is only showing 12.3V - what's wrong?

Recently, the fan belt, tensioner and battery light came on in my 2004 Ford Mondeo. I had belt and tensioner replaced, but battery light still. I checked the battery voltage for charging, with the engine running, but it's showing a voltage of 12.3V.

Asked on 15 September 2017 by Trevor

Answered by Alan Ross
If you only have 12.3V with the engine running then your alternator has failed and needs replacing.
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