Have this message (and battery light) appearing periodically with no rhyme or reason. I've replaced the alternator and both batteries within the last year, so don't think they're the culprit. What else should I be checking? Auto Zone scan said "#3253 12V CHARGE ALT REG FAILED CODES (?) PASSED". Vehicle in question is a 2007.5 Silverado 2500 with the 6.6, FYI. Thanks in advance for your feedback.
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