Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Have you scanned the computer system to see if there is any fault codes setting, in most cases if the battery light is coming on there should be .
If in fact you are getting a fault code P1638 then in most cases this codes sets due to a bad alternator. This code can set and the battery light will come on even when the alternator is charging. I would suspect that is what you have going on here.
Im not sure about the person on line but the light will not come on due to a bad battery, the charging rate and battery light are controlled by the duty cycle from the PCM (computer) to the alternator internal regulator. Before you replace anything you really do need to start with having the computer system scanned to see what the fault code is that yours is setting.
That would be the next correct step for you. Once you have it let me know and we can work from there.