Ok so I've gone and gotten my battery and alternator tested and charged. A full charge on the battery made no difference, and the alternator tested very good. Still squeals.
Next, I pulled off the belt and checked all the pulleys and bearings to make sure they were all good, and they are. I checked alignment and there doesn't seem to be any alignment issues with any of the pulleys or belt placement.
Lastly, I had a friend do some acceleration while I watched for alignment from above and below...and for the first time I could hear where the squealing seems to be coming from. It sounds like it's coming from the harmonic balancer....which is what was replaced to start off this whole problem. It doesn't appear to be off alignment and I can't make out exactly where it's squealing from. So, what are the possibilities for the harmonic balancer to be the cause?? And what exactly would cause it? Or is it just possible that's where the belt is slipping but it's cause is elsewhere, like the belt itself?
A few of you posted you think it's just a bad belt. That's my next try, to buy a new belt......but, what's weird is that I put the old belt back on and it still squealed. The old belt had been on it before changing it without any squealing, so by switching back to the old belt, it shouldn't squeal....right?
And another small piece of info is that the squealing seems to have quieted down a bit, all on its own. Like the last post said, I think it has to do with the summer temperature going up. I also sprayed a little water on it and it got quiet for a few seconds. I read somewhere to do that and if it quiets down, it's most likely an alignment problem. Is this true?
Thanks for the help so far, I'm really stumped on this one. I'm going to go buy a new belt and try that, otherwise I have no more ideas.