2006 Chevrolet Cobalt Logo
Posted on Jul 29, 2011
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The battery is good..how can i tell if its the alternator

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  • Posted on Jul 29, 2011
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Most auto parts stores offer testing for free. A volt meter can also be used to check alternator output. Connect the meter leads to the battery. The voltage should be at least 12 volts. If it isn't, then find out why. Just because a battery is new does not mean it is fully charged. If the battery voltage is OK, then start the engine and observe the meter. It should now read approx. 13.5-14.5 volts. If it does, then the alternator is charging. If it isn't, then the alternator should be tested. While your at it, you might as well check your belt tensioner for proper operation.
1. leave the engine running and the meter connected.
2. Turn on your lights and other accessories. (heater, radio, high beams)
3. Observe the meter reading.
The voltage should remain between 13.5-14.5 volts. If it doesn't, then determine the cause and repair as needed. If it does, then the tensioner and belt are probably OK. I hope this information is helpful to you and thanks for using FixYa.

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