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