2003 Ford Taurus Q&A
2003 Ford Taurus Question: will a noisy possibly faulty alt. cause stalling and engine lite to go on?
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. - csubak30
have codes scanned to see if they pertain to low voltage issues - globalhelper