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I replaced my battery about 12 months ago as well as my alternator. About 3 months ago I had to replace my alternator again. Driving home today the battery light came on yet again and my battery was going between 11.9-12v. Any idea what’s going on?
 

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How did you diagnose the faulty battery and alternators? Were they load tested?

Have you checked for DTCs with an advanced scantool?

How do the underhood grounds look?
 

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Discussion Starter #3
How did you diagnose the faulty battery and alternators? Were they load tested?

Have you checked for DTCs with an advanced scantool?

How do the underhood grounds look?
The first time I called AAA and the guy checked hooked up his machine to my battery. He said it was my alternator and my battery also needed to be replaced.
Second time I went to AutoZone and the guy checked My battery and it was fine. Then hooked up his scanner and said it was my alternator.
This time the battery light came on the dash and I went into the advanced settings and the car gave me error code P2503.
i checked the under hood ground and it looks fine.
 

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P2503, Service Manual Extract:

"Possible Causes
EXCESSIVE RESISTANCE IN THE BATTERY POSITIVE CIRCUIT
EXCESSIVE RESISTANCE IN THE CASE GROUND
(K20) GEN FIELD CONTROL CIRCUIT SHORTED TO VOLTAGE
(K20) GEN FIELD CONTROL CIRCUIT OPEN
(K20) GEN FIELD CONTROL CIRCUIT SHORTED TO GROUND
(Z904) GEN GROUND CIRCUIT OPEN
GENERATOR
PCM"

If the alternator has been replaced recently, check that the field control terminal has been re-connected.
 
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