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Not usually. The alternator can fail to charge enough, or even fail to charge at all, but usually the battery would carry the load for a day or two. - The answer is to charge your battery completely, over a 24 hour period then check the alternator with a good meter. First check battery voltage with engine OFF, this should be 12.1 -12.4 volts. Now start the engine and do the same test, voltage across battery should now be around 13-14.5. If still the same as static test then the alternator is faulty. You may not necessarily have to buy a new alternator, in many cases you can renew the 'diode pack' for much less cash. - -Go to a Starter and Alternator specialist shop for advice on this.

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12y ago

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