There could be so many reasons because of this I'm not real sure where to start. It could be a internal engine problem, electrical issue, ignition issue, security/alarm issue, emissions issue, ect..
How do you know the noise is coming from the alternator? Could it just have been the heat shield shaking?
There is a bulletin about a recall on the B+ terminal on the alternator that goes out frequently.
Check for power going to the ignition control module and we can go from there.
Friday, June 28th, 2013 AT 6:20 PM