Question about 2003 Mazda MPV

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Battery isn't charging.

The alternator test is good but the battery is not charging.

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  • twinns Nov 11, 2008

    The battery isn't charging but the alternator & the battery are both tested to be good.

  • twinns Nov 11, 2008

    them battery is rating good

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Check if the battery as the rated voltage ,if its not the rated voltage then the battery may be bad ,replace the battery ......

Posted on Nov 11, 2008

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The battery needs 12.6 volts or more to be in service
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Could be the diodes got fried & you need a new alt
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Have you replaced the voltage regulator?
Unless you have changed the charging system and eliminated it, the alternator does not have a built-in voltage regulator like the newer ones do.
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Nov 16, 2012 | Ford Cars & Trucks

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Daughter called me ..car wont start. checked battery at Autozone...it is good. someone stopped to help them and bang on startere and it starts up. Bad starter. Starter replaced. Next day daughter...


it sounds like you have blown fuse to the Alternator.. I don't know what car you are talking about but they charging systems vary.. But if alternator isn't getting all the power it needs it won't charge. this should be checked.

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Brake and Batt warning lights on at same time while engine running. Brake fluid is max and alternator belt looks good.


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1 Answer

The battery is good..how can i tell if its the alternator


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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My car keeps dying out, could it be the battery or alternator?


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The battery dosn't receive charge and I just ckecked the alternator and is good, this output good charge, I think the regulator isn;t working but the alternator dont has it, some one told me the...


its all in one ,start engine and hold RPM at 1500 then disconnect the battery ,if engine continues to run with all the lights on and AC ect then alternator is ok ,if this is the case then renew the battery

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