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Check the alignment of belt in relationship to all pulleys. Check tensioner. Check the condition of the pulleys. Also make sure the belt being replaced is the recommended size. Auto shops have belt measuring tools to check the size of the belt before installing into your vehicle. You may have had a belt installed that was too large in the first place. The squeaks are a sign of a loose belt, belt not recommended for your vehicle, or bearings going out in one of the belt driven components. The burning smell would be the bearings.
I believe that the alternator needs replacing or at the very least, rebuilt. As for two belts around the same pulley. Don't think so. There can only be one belt that drives the alternator. The Mazda 626's alternator is extremely hard to replace, which only leaves me to believe that the mechanics you spoke with KNEW that it needed replacing but did not want to fool with it because of the difficulty in doing so.
For the other belt that broke, listen for noises coming from any of the components that the belt drives. It may also have bad bearings and needs replaced.
Just wondering here. Did the same mechanic replace both belts? It sounds like they are not using the correct size belt, or they are just not installing it correctly.
I hope this helps.
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Tuesday, December 9th, 2008 AT 2:52 AM