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.

by in Minneapolis, MN on November 01, 2012
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2 answers
ANSWER by , November 01, 2012
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.
ANSWER by , November 01, 2012
have codes scanned to see if they pertain to low voltage issues