bad bearings on pulleys?

This thread is in reference another thread I started regarding belt noise. The details of the issue are in this thread here:http://www.tacomaworld.com/forum/1st-gen-tacomas/173318-noisy-belt-s-loose-belt-s.html

Since then I adjusted and tightened all the belts a little bit - I just took a trip that put about 800-1000 miles on the belts, I thought perhaps they extended/loosened slightly?

I used the below linked guide on changing the belts. In retrospect, I'm not sure if I was supposed to (via the guide - and I'm not blaming the guide's author in anyway) tighten the pulley bolts more than I did. If I over tightened them, could the bearings inside them have been damaged and therefore are contributing to the noise/squeal?

http://www.tacomaworld.com/forum/1s...nge-your-belts-p-s-c-alternator-2-4-2-7l.html

The squeal starts around 30mph and does not occur when revving the engine in park/neutral.