More likely the bearings in your alternator wearing out. Get a new alternator.
You need to lubricate and clean it.
You'd have to define "better", and also exactly what you're seeking - we don't know if you're trying to deal with squealing noise, grinding noise, etc. or you want your car to sound more tuned.
That is the sound of metal on metal. I suggest you immediately take your car to a mechanic and have the brake pads replaced before you cause too much damage to the discs.
When it is time to change the brakes on your 2001 Mitsubishi Montero, they will make noises. There could be a grinding or squealing noise that you will hear.
Loose or glazed fan belt?
No! Something is wrong.
Loose or worn belt(s).
If a car is making a grinding noise in the right back wheel, it could be a sign that a wheel bearing is failing. It is necessary to take the car to a qualified mechanic for repair.
your brake pads are probley wore out so its grinding on your rotor
Its hard to say... do u know where the noise is coming from?
Your question is vague, but since you used the words "squealing/grinding" I first start to look at the brakes. The squealing could be coming from your brake pads. Some brake pads come with a safety mechanism that alerts to when the brake pads are nearing replacement time. If you ignore that squealing then it turns to a grinding because there ain't no brake pad left. At this point, you're now looking at replacing the rotors as well as the pads. Rule of thumb is that if one side is bad then the other is just as bad or not far behind it.
It sounds like the fan-belt is slipping.