Squeaky noise from alternator,how to stop it?

A squeaky sound coming from underneath your 2015 Nissan Versa Note, even with low mileage, can be worrisome. While it's difficult to pinpoint the exact problem without a physical inspection, I can suggest some potential causes based on your description and the symptoms:
Possible reasons:
Worn suspension bushings: These rubber parts connect various suspension components and can dry out or develop cracks over time, resulting in squeaking when they move.
Loose sway bar links: These control bars aid in stabilizing your car during turns and can become loose, leading to clunking or squeaking noises.
Loose or worn-out serpentine belt: This belt drives various accessories such as the alternator and power steering pump. When it's worn or loose, it can produce a squealing sound, particularly when starting or accelerating.
Dry or worn CV axle boots: These rubber boots protect the CV joints that transfer power to the wheels. If they are dry or torn, they can cause squeaking, especially during turns.

Additional information for diagnosis:
Does the squeaking occur consistently or intermittently?
Does the sound change in pitch or intensity when turning or braking?
Is there any noticeable vibration or pulling to one side while driving?
Have you observed any other changes in the car's handling or performance?
Recommendations:
Schedule a service appointment with a qualified mechanic: They can examine the suspension, brakes, and other potential sources of the noise and provide an accurate diagnosis.
Do not disregard the noise: Ignoring it could lead to more serious issues and costly repairs later on.
Gather any additional information you can: If the noise seems to occur under specific conditions, make a note of them to assist the mechanic in their diagnosis.
While your low mileage may suggest that the issue isn't significant, it's always best to have it checked by a professional. Early detection and repair can save you time, money, and potential safety risks in the future.

You need to test using a multimeter of you are getting charge , should be around 14.4 volts with engine running then turn on all accesorys to see if it handles load , lights , aircon , radio etc , if pulley is squeky throw a bit of water on belt if noise goes away temporarily it is the belt if not you have to replace alternator , alternator pulleys are nit really interchangeable , just buy a second hand one

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Yes I would say alternator is faulty

Spray same water on the belt to see if whistle goes out that means loose belt. 2nd remove belt and check shaft for any gaps in and out and up and down start for a minute to see if the squeaky noise cam from there.if is noise stop is your alternator bearings to Replace then fit the belt and adjust .

I assume that the squeaky noise stops after 15 minutes, not the engine. If that is the case, you may have a very worn belt. This won't cost you a ton of money. You have a serpentine belt on your car, so that is a likely culprit. You may also have a bad battery, which in cold weather would perhaps have just enough to start the car but would also demand the alternator (and by extension, the belt) to provide enough amps to recharge the battery after a severe draw,
Before the winter, I recommend a new serpentine belt and a new battery, after a test of your alternator output and the battery at a good shop. You should not expect to spend more than $200 max, if everything is wrong.

That's where I'd go first. check with driveline unloaded (neutral with wheels off the ground.)

semi-metallic pads can cause noise from glazing over if you are too rough on them, or a crappy pad composition. get some BG brand STOP SQUEAL and apply it to the pads. clears it right up

nissan has an updated belt tensioner and it will also get a new belt.