If you have replaced all this it may not be a belt. It may be your alternator itself. These have bearings inside them and they do wear out. The only way to check is to remove the belt and spin the alternator to see if that is what is noisy. It may wobble if the bearings are bad. It should turn smoothly if not.
A worn serpentine belt will make a high-pitched squeal when the engine is running. The faster you go, the louder the high-pitched will become.
Check the tention on the serpentine belt, it may need to be tightened or replaced if the rubber is cracked and dry rotted looking.
could be alternator. could be alternator.
Here are several suggestions and answers from FAQ Farmers: * It could be the belt for your alternator, as that's what happened with my car. * One possibility would be the brake pad wear sensor. Another would be a loose or slipping serpentine belt. It depends on the sound and how it builds when you start moving.
The reason why it won't start is because its your alternator...... My uncles chev truck made the same kinda sound when his alternator went....
Belts which are at incorrect tension levels can cause a squealing, or if they are wet. This is often caused by a worn belt tensioner on its way out. If so, it will soon seize up, or come apart, leaving you stranded with a shredded or loose serpentine belt. The squeal can also be caused by a worn serpentine belt (lots of cracks in the underside), a worn steering pump, a worn water pump, a worn alternator (these usually whine rather than squeal), or anything else that turns, such as an idler pulley.
Every ball pitched is taken out and replaced.
your serpin belt needs replaced
Just paid ~500 for labor + ~460 for new alternator... when i started my RRover(bigBody not sport)....it was making this mid-pitched woo sound(that followed the revving of the engine)...they said it was the alternator "bearing"...but the entire alternator needed replacing...love my truck, but she's high maintenance...LOL
could be a bad water pump or a loose alternator belt
Just had the same issue.....it is quite possible your water pump. try this look at the fan located near the belts. If it moves when you tug it, then it is definetly your water pump.But before you dive in to replace the water pump or the alternator, first remove the serpentine belt idler located under the alternator. Find an auto parts store that carries bearings (About $13.00 to $15.00) and have them press a new bearing into the idler housing. Re-install and test engine for high-pitched noise. If noise is gone, you just saved yourself a lot of time and money. A replacement alternator would have cost about $200.00 from a parts store and maybe $300.00 from a dealer. If you try to buy a replacement bearing from a dealer they will offer you a complete idler assembly for around $50.00 and you have to remove the alternator to replace the idler assembly. Of course if the noise doesn't go away, then you are out only $13.00 and have to replace the water pump or alternator anyway. Personally, I would replace the alternator next because it's easier to get to than the water pump. If that doesn't get rid of the noise, you can take it back and get the water pump. I just went through this with my 05 TB. The idler was the problem.