Question about 2004 Mini Cooper
Yes, a good alternator on a good battery should deliver between 14 and 14.5 volts with the engine running. The first thing you should do is to check the contacts on the battery - make sure they are not oxidized, clean then thoroughly inside and out with wire wool.
If the voltage remains the same then you must test the battery - take it out of the car and put it on a charger ; if after 6 hours, without the charger connected, the voltage is below 11 volts then the battery (or more precisely one of its cells) has failed, you will need a new one.
Finally borrow a battery from someone - even an old one will do as long it has 12 volts unconnected) - and put it in and measure the voltage again - if it's below 13.8 then you will need a new alternator and to find out what is causing them to fail so fast. Most likely it's a bad connection that overstresses the regulator .
Posted on Oct 16, 2010
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Posted on Jan 02, 2017
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