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will a noisy possibly faulty alt. cause stalling and engine lite to go on? on 2003 Ford Taurus

just put in new ign.coil ran good for a day now sounds really
rough with chattering from alt.

Asked by for the 2003 Ford Taurus
have codes scanned to see if they pertain to low voltage issues
1 more answer
The pulley on the alternator has probably got a bad bearing. That would be the chattering. If the alternator itself is going bad, you will get a multitude of electrical failures all over the vechicle going in and out. Get alternator tested but with the bad pulley you will probably have to replace it anyway.