Battery Light question
My wife has a 2006 mustang v6 4.0, and the other day the battery was unresponsive and car had to be jumped off.
That evening when she got home, I checked the battery(engine off) with multimeter, and found it to be 12.92 volts. Sounds good to me.
I proceeded to start the car and watched the alternator send the volts up to 14.20. Still sounded good to me.
Well the battery light started coming on. I also found corrosion (lots of it) aroung the positive terminal of the battery. I removed the cable clamps and cleaned both clamps and posts with a post cleaning brush.
Still for the next day the light would come on and she explained that the battery light would go on and off as she drove home from work.
The next day, dead battery. We replaced the batter that evening and I figured it must have a bad cell or something.
Were now on the second day with new battery and the light is still coming on. Any ideas?
Could the alternator be going bad? Auto store tested system twice as well. Both tests showed good voltage. One of the tech's said that there was a bad "ripple" in the alternator and it could be going bad. But it's putting out 14+ volts. My wife also explained a whining noise that the frequency goes up and down as the rpm's do. I'm thinking that it could be a bad bearing in the alternator. Wouldn't that impede on the performance at intervals if it has a bad bearing?
Any thoughts,suggestions, any advice would be greatly appreciated!