Originally Posted by jwko
Just did a search and found numerous complaints from users with similar problems such as yours on several year models of Taurus'. Out of the dozens of articles I only found 2 people bothered to report a fix, replacing the alternator due to a bad diode randomly shorting out the electrical system One recommended buying a new alternator over a rebuilt as they went through several from Autozone until finally buying a new Motorcraft from Napa with no problems since.
This may or may not be your problem. Just wanted to pass along this info.
Thank you. Oddly enough I seem to be having alternator problems with my Jeep, but that's a post for another forum.
My wife took it by Autozone while I was at work and they tested the battery twice and it was coming up fully charged, but they were saying the battery was bad. I went by later and it was testing fine apparently. It was still under warranty, so I got them to replace the battery for free. If nothing else, that should eliminate a possibility.
I don't know why it would potentially be a battery issue according to them though. It cranks fine, both from a cold crank and after a stall. It was a free replacement since the battery is less than 2 years old, so I wasn't going to argue with that.
I have heard the term "alternator whine" before and have read that it can be heard through the radio. I am hearing a high pitched whining noise when the radio is on. Not sure what the whine would be an indicator of and whether or not it's a bad thing.