Joe Boulay 9/29/2012First check your main battery ground and positive cables and make sure they are clean and tight. The voltage regulators in those alternators have had issues in the past with overcharging. Turn the headlamps on and monitor headlamps and see if they brighten and dim continually. monitor alternator voltage output simultaneously should not be more that 14.50 volts @ idle. hope this helps you.
Carrie 3/6/2013I have had similar issues in recent years with my ex. I have the same model and year as yours. If your alternator is overcharging, it will eventually quit working altogether and also because of the constant strain of overcharging you will most likely have other electrical issues such as multiple Starter replacements within a year. Best bet is to replace the starter as soon as you can to prevent other issues. eventually, your alternator will die out and in doing so, it will cause your car to shut down. first, you will notice your head lights diming drastically and the speedometer will follow, and engine will cut off. This is fairly dangerous if you are driving at night or on the interstate. Be cautious!