Mysterious oil leak from engine onto alternator/power steering belts - where could this be coming from?

SOURCE: Alternator belt squeals under load

check all the pulleys for alignment and wear, Also check the alternator output (make sure it is not always under load) hook up and ammeter on the positive) what

Are you running a large stereo? if so this can cause this especailly if the large stereo is not fused

SOURCE: Replacing 2 belts on a 2000 Mazda Protege

I recommend that you go to any Auto Parts store and by a repair user manual for your 2000 Mazda Protege.  They have pictures and arrows and stuff that you will need to do the whole job.  The non-Mazda version will cost approximately $15.00.
Because of the tensioner that may come off when while you are doing these belt changes, it is too complicated to talk you through this.
But with the manual, I am confident you can change them.

SOURCE: alternator drive belt squealing

yeh, mine did the same thing with a hydralic belt. it was the bearings. mazda capellas use a lot of 6202 bearings which, luckily, are fairly cheap, and are commonly used in pool pumps. so you can find them at pool pump repair stores. although pool pumps use 6202 2RSR bearings. these are just the water proof type, but are excactly the same size and can be used.
to test if it is a bearing problem, remove the belt and try to twist the individual wheels by hand, you should be able to turn the 2 smaller ones.
from memory the alternator belt is in a fairly in accessable postition so the belt is going to be hard to put back on.try other things first, like wiping the inner side of the belt with a dry cloth to remove moisture.
worst case senario is your alternator has, or is starting to, seize up and you need to replace it.

SOURCE: Belts squealing

is your belt slipping? You may have a bad tensioner pulley. Check all pulleys make sure they will spin and not lock up, if they feel really tight or after rotating them around several times they get tight replace

Steven A

• 427 Answers
• Posted on Oct 07, 2009

SOURCE: My 97 miata has been having terrible squeaking

The alternator is loading up too much for some reason.
Had the same issue on my friend's 2001 Mazda Protege. Turned out the voltage regulator in the alternator was faulty. Had the alternator rebuilt. A week later, it acted up again! There is apparently another issue, but I have not been able to figure it out.
Unfortunately, I don't have a clear answer for you, but, one's thing's for sure. Mazda has to stop using crappy Ford electrics in their cars.